“But even if we or an angel from heaven should preach a gospel other than the one we preached to you, let them be under God’s curse! As we have already said, so now I say again: If anybody is preaching to you a gospel other than what you accepted, let them be under God’s curse!” Galatians 1:8-9
With what the scripture just said, it is amazing that several religions started from the claim that some guy saw an angel who told him that he was to write a new book and build a new church, etc. And lo and behold, these religions have grown to huge numbers, and they all begin in violation of the scripture listed above.
The Bible is God’s word, and it is efficient to save the soul of man, so we need no new Bible, nor do we need a new church other then the one listed in the Bible.