Same problem. God is not about a belief system. IMHO
I disagree. The word Rabbi = Teacher = what Jesus is, and teaching is intricately linked with doctrine. In fact most of Jesus' ministry was about doctrine, which included Jesus fighting against false doctrine. He offended a lot of people that way, those who regarded the doctrine of Christ as false.
Part of what Jesus taught was a prophecy regarding two things: His return, and the coming destruction of the city and temple, and He referred to the prophecies of Daniel when He taught this doctrine. The Revelation too is a Revelation of Jesus Christ. The apostles prophesied also.
The Bible is full of doctrine, The religious beliefs of the Jews and of all peoples contains a great amount of doctrine. The Bible is full of doctrine about God, and also contains a great amount of prophecy regarding end times (eschatology). It's you who calls it all "man-made doctrine". The only man-made thing is our inability to understand everything aright, because we do not ask God enough to give us understanding.
Christian doctrine itself is not man-made. It's God-given. For you it's a case of "Problem: Doctrine causes division (because of human fallibility). Solution: Don't bother about doctrine.
I disagree with your solution.