How come Christians teach the Trinity when the Bible never uses that word?

Then God said, “Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.”

During the days when Christ's apostles lived, the Gospel was taught with accuracy, but after their death, it did not take very long for the truth to become eroded with falsehoods.
This erosion of Biblical truth grew like a cancer -- slow, but sure. Little by little, inacuracy crept in as the Gospel message of Jesus Christ became more and more popular.
In an effort to increase the church membership, many Pagans were brought in and with the Pagans came Pagan ideas. Rituals began to replace serious Bible study and differences in opinion soon became the basis for growth of various creeds and sects. Ober the span of many years, man-made rites became time honored tradition.
Christian leaders then became powerful forces in the church as well as in politics; religious beliefs, many times, were dictated by the state. These facts, however, are not surpirsing considering the Biblical warning:
"First of all you must understand this, that no prophecy ever came by the impulse of man, but men moved by the Holy Spirit spoke from God."
"But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Master who bought them.... And many will follow their licentiousness, and because of them the way of truth will be reviled. And in their greed they will exploit you with false words...." (2 Peter 1:20-21; 2:1-3)

Gen 1:26-27
26 Then God said, “Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.”
27 So God created mankind in his own image, in the image of God he created them; male and female he created them.
From this passage we could deduce that in some way, God is in some manner plural. (We can also see that the image of God is both male and female, even though scripture consistently refers to the Godhead in the male gender).
Actually, though it’s not obvious from the English, the first indication of plurality in God is in the very first verse in the Hebrew word for God:
The Hebrew word translated “God” is the word El or Elohim. Elohim is the plural form of El. The plural form is used 2607 of the 2845 times the word “God” is used in the Old Testament. Not only is the word for God usually used in the plural form, but several verses refer to God as “Us”
An example of how the Hebrew word Elohim is used in the plural is that it is translated “gods” (referring to idols) 235 times in the Old Testament. It is exactly the same word that is translated “God,” referring to the Almighty. An example is given below:
"I am the LORD your God [Elohim], who brought you out of the land of Egypt, out of the house of slavery. "You shall have no other gods [Elohim] before Me. (Exodus 20:2-3)

God said, “Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.”
27 So God created mankind in his own image, in the image of God he created them; male and female he created them.

The Trinity is one God existing in three Persons. Understand that this is not in any way suggesting three Gods. Keep in mind when studying this subject that the word “Trinity” is not found in Scripture. This is a term that is used to attempt to describe the triune God—three coexistent, co-eternal Persons who are God. Of real importance is that the concept represented by the word “Trinity” does exist in Scripture. The following is what God’s Word says about the Trinity:

  1. There is one God (Deuteronomy 6:4; 1 Corinthians 8:4; Galatians 3:20; 1 Timothy 2:5).

  2. The Trinity consists of three Persons (Genesis 1:1, 26; 3:22; 11:7; Isaiah 6:8, 48:16, 61:1; Matthew 3:16-17, 28:19; 2 Corinthians 13:14). In Genesis 1:1, the Hebrew plural noun “Elohim” is used. In Genesis 1:26, 3:22, 11:7 and Isaiah 6:8, the plural pronoun for “us” is used. The word “Elohim” and the pronoun “us” are plural forms, definitely referring in the Hebrew language to more than two. While this is not an explicit argument for the Trinity, it does denote the aspect of plurality in God. The Hebrew word for “God,” “Elohim,” definitely allows for the Trinity.

In Isaiah 48:16 and 61:1, the Son is speaking while making reference to the Father and the Holy Spirit. Compare Isaiah 61:1 to Luke 4:14-19 to see that it is the Son speaking. Matthew 3:16-17 describes the event of Jesus’ baptism. Seen in this passage is God the Holy Spirit descending on God the Son while God the Father proclaims His pleasure in the Son. Matthew 28:19 and 2 Corinthians 13:14 are examples of three distinct Persons in the Trinity.

  1. The members of the Trinity are distinguished one from another in various passages. In the Old Testament, “LORD” is distinguished from “Lord” (Genesis 19:24; Hosea 1:4). The LORD has a Son (Psalm 2:7, 12; Proverbs 30:2-4). The Spirit is distinguished from the “LORD” (Numbers 27:18) and from “God” (Psalm 51:10-12). God the Son is distinguished from God the Father (Psalm 45:6-7; Hebrews 1:8-9). In the New Testament, Jesus speaks to the Father about sending a Helper, the Holy Spirit (John 14:16-17). This shows that Jesus did not consider Himself to be the Father or the Holy Spirit. Consider also all the other times in the Gospels where Jesus speaks to the Father. Was He speaking to Himself? No. He spoke to another Person in the Trinity—the Father.

  2. Each member of the Trinity is God. The Father is God (John 6:27; Romans 1:7; 1 Peter 1:2). The Son is God (John 1:1, 14; Romans 9:5; Colossians 2:9; Hebrews 1:8; 1 John 5:20). The Holy Spirit is God (Acts 5:3-4; 1 Corinthians 3:16).

  3. There is subordination within the Trinity. Scripture shows that the Holy Spirit is subordinate to the Father and the Son, and the Son is subordinate to the Father. This is an internal relationship and does not deny the deity of any Person of the Trinity. This is simply an area which our finite minds cannot understand concerning the infinite God. Concerning the Son see Luke 22:42, John 5:36, John 20:21, and 1 John 4:14. Concerning the Holy Spirit see John 14:16, 14:26, 15:26, 16:7, and especially John 16:13-14.

  4. The individual members of the Trinity have different tasks. The Father is the ultimate source or cause of the universe (1 Corinthians 8:6; Revelation 4:11); divine revelation (Revelation 1:1); salvation (John 3:16-17); and Jesus’ human works (John 5:17; 14:10). The Father initiates all of these things.

The Son is the agent through whom the Father does the following works: the creation and maintenance of the universe (1 Corinthians 8:6; John 1:3; Colossians 1:16-17); divine revelation (John 1:1, 16:12-15; Matthew 11:27; Revelation 1:1); and salvation (2 Corinthians 5:19; Matthew 1:21; John 4:42). The Father does all these things through the Son, who functions as His agent.

The Holy Spirit is the means by whom the Father does the following works: creation and maintenance of the universe (Genesis 1:2; Job 26:13; Psalm 104:30); divine revelation (John 16:12-15; Ephesians 3:5; 2 Peter 1:21); salvation (John 3:6; Titus 3:5; 1 Peter 1:2); and Jesus’ works (Isaiah 61:1; Acts 10:38). Thus, the Father does all these things by the power of the Holy Spirit.

GOD THE FATHER,
GOD THE SON &
GOD THE HOLY SPIRIT
WERE TEMPTED IN THE WILDERNESS
What? You mean to tell me that all three were tempted in the wilderness? Well let’s compare scripture with scripture and see just exactly what the Bible says about it, shall we?
The following three passages of scripture clearly show that God is three in one (a Tri-Unity).

  1. THE LORD - (JEHOVAH GOD) - Wherefore the people did chide with Moses, and said, Give us water that we may drink. And Moses said unto them, Why chide ye with me? wherefore do ye TEMPT THE LORD? (Exodus 17:2)
    Who did Moses say was tempted? Why the LORD GOD OF ISRAEL of course. Look at the context and see for yourself. Now take a look at this next verse and see what the Bible says about Jesus Christ being in the wilderness.
  2. CHRIST - Neither let us TEMPT CHRIST, as some of them also tempted, and were destroyed of serpents. (1 Corinthians 10:9)
    Did you notice that in the contexts the LORD in His word uses both the Father and Christ interchangeably in the above passages? Now hang onto you seat because the Bible not only uses the Father and the Son, but next comes another personage in the Bible
    that was tempted in the wilderness.
  3. THE HOLY GHOST - Wherefore (as the HOLY GHOST SAITH, To day if ye will hear his voice, Harden not your hearts, as in the provocation, in the day of temptation in the wilderness: When your fathers TEMPTED ME, proved me, and saw my works forty years. (Hebrews 3:7-9)

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