Illogical.
The apostles and witnesses were still alive when during Paul's ministry. If Paul was lying and fabricating, why didn't the other apostles and witnesses confront him?
Hate to break it to you but they DID. The Jerusalem Church disagreed quite strongly with Paul. They fought it out.
Here's a question for you: why would the man who never saw Jesus in the flesh have more say in how the religion formed than the people who walked with Christ in the flesh in real life?