Only thing is he taught us to think for ourselves, lol. To his dismay, I became an atheist in final year of religious training. Lucky for me, our religion loves a good argument on the topic so dad took the attitude it was a phase that would pass and didn’t get upset.
I have heard this happens to seminarians fairly often. However, after having invested so much time, money, and emotion in the training venture, some just fake it and go on to serve in the ministry. Since the goal for many is to served the suffering and preach good works, they manage to live their internal conflict successfully.