[Ali Imran]

While there are minor differences in wording and some passages included in later versions, the core text and meaning of the New Testament from the 4th century is largely the same as what is found in modern Bibles. There are no significant alterations or fabrications that would change the fundamental doctrines of Christianity.

Even if the NT is badly corrupted, the Trinity will not be affected. The reason is simple. The Trinity is not explicitly taught in the NT.