I'm sorry if you feel guilt about such things (seriously), but I would argue you could still abandon most of the tenets of catholicism and even deism and still be a great foster parent and a great human being. I don't think walking away from all that stuff immediately chucks your moral compass out the window. The thought of the bullshit randomness of our existence and the reality of our own mortality freaks us out sometimes. But is embracing a bronze age book of myths that even its own followers can't agree on any better? I dunno, just a thought....