What happened to Christians who questioned their creed?
Porphyry (3rd century philosopher) wrote a 15-volume refutation of Christianity, the gospels and resurrection
Celsus (2nd century philosopher) rejected the impossible concept of the resurrection
The imperialistic power of the church, and its stranglehold on intellectual endeavours was such that the above books and many more perished in the pious book burnings in the 4th century. Today, our knowledge of these books is limited and known through the refutation books which had to quote the destroyed books.
Once Christianity was established as the state religion, it became dangerous, as a subject of Rome, to question the doctrinal version of events.