Someone who was frum and became frei is a rasha
I would say that someone who was frum and became frei is called a porek ol.
If someone kept all the mitzvos because he grew up being told that he needs to do mitzvos because they are good for his heart. Then he has a heart attack. You wouldn’t call him a rasha for not keeping the mitzvos anymore, he was just misled to begin with. This is not really any different.