The doctrine held by most Christians, that there are three divine persons (Father, Son, & Holy Spirit), United in one Supreme Divine Being.
Can you be considered a Christian without the Trinity?
Mattew 12:32, 28:19
1 Cor. 12:4-6
2 Cor. 13:14
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What are the Churches that are considered “Old Testment Doctrine”?
It looks like the “Old Testment” of the Holy Bible is God (considered God the Father) and The Holy Spirit, following “The Law of Moses”.
Moses came to bring the law, but Jesus Christ brings truth and grace.