And in the relatively rare ideologue class, the shifts are often pretty big too. I knew a gal who went from seminary->Leninism->WIcca/EnviroProgressivism. Lots of atheist ideologues are former fundamentalists. Conservatives who were former marxists.

This kind of stuff happens very often among people in their late teens in my home town. (Most but not all of them just support political ideologies the way they'd support football teams.)