[Ali Imran]

It is not like someone purposely wrote something false....it was there in the manuscripts but not found in the oldest

It is the only verse in the entire NT that would explicitly confirm the Trinity. Someone added it in. Again, my guess would be to completely silence the Unitarians.

There were Christians who rejected the Trinity in the early days of Christianity. And then, they were wiped out by the Trinitarians. A famous Unitarian was Michael Servetus, was burned alive for rejecting the Trinity.