14:16 I will pray to the Father, and he will give you another Counsellor, that he may be with you forever:
Both the Bible and Quran state that God makes promises and keeps them. If God didn't protect his transmission of promises, how would we know he has kept them, especially when considering promises about Muhammed for example?
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The trinity is the foundational teaching of the Bible that God is one God, who has eternally existing in three persons, Father, Son and Sprit who each are fully God. This idea is denied by the Quran, which states that God is an indivisible unity, who can have no partners. The Trinity, while mysterious, is simple to define and a beautiful truth we can confidently hold to and reference in reaching out to others.
Is Muhammad Foretold in the Bible?, John Gilchrist