Why is understanding about the Trinity essential for being a Christian?
Thus God reveals Himself to us as we can be able to understand and comprehend. We tend to throw our own spin and sin into the works and create the arguments ourselves, when God's Word clearly spells out His nature! This doctrine may be hard for most people to understand, nevertheless it is true and essential for us to know the One True God. Basically there is one God who reveals Himself in three personalities, in theology they are called "Substances".
There is God the Father (Gen 1-2; 6:5-7; Ex. 20; 32:9-14; I Kings 8:27; Psalm 90; 102:25-27; 145:18; Isa. 40:12-31; 66:1; Mal. 3:6; Matt. 10:29-30; John 4:24; 5:26; Acts 4:34-35; 17:23-25; Eph. 1:11; II Pet. 3:8; Rev. 4:10);
God the Son (John 1:-18; 20:28-31; Acts 7:59; Rom. 9:5; 10:9-13; II Cor. 12:7-9; Phil. 2:5-6; Col. 1:15-17: 2:9; Heb. 1:1-12; I Pet. 3:15); and
God the Spirit (John 14:1626; 15:26-27; 16:7-15; Acts 5:3-4).
All three are proclaimed together in Matt. 28:19; Rom. 8; 15:17-29; II Cor. 13:14; Eph. 1:3-14; II Thess. 2:13-14; I Pet. 1:2; Rev. 1:4-5). These are not separate God's, this would be "Tritheism", nor are they one God acting out three roles, this would be "Modalism". Even though the word "Trinity" as a word is not found in the Bible, however the concept and essence is clearly stated. And the concept is one God with three conversing distinct ways to reveal Himself, "Personalities:, or "Substances". They are co-equal and co-eternal, they each have full divinity, yet are a distinct Person. We are required to give equal devotion and worship, but they are not three, but One in purpose and unity.
© 1992, 2001 R.J. Krejcir, Schaeffer Institute of Church Leadership, www.churchleadership.org/