These things take time. What matters is that he is sincerely looking for the truth, and someone who is, will day by day get closer to it.
[Andrei] Sakharov (like other heroes of this transition) says that even his and their minds were under a profound "hypnotic spell"; and this psychological distortion has left its mark on many of them to this day.
These things take time. What matters is that he is sincerely looking for the truth, and someone who is, will day by day get closer to it.