Well, I'm new here, so I'm not sure if this is the right place to ask this. But, here I go anyway.
One thing, that I never understood while trying to be Catholic, is heaven and hell. Basically, in most religions, God/s judge/s people's souls (assuming they exsist) and sends them to heaven or hell for eternity. These are called different things, in different religions, but the basic concept is the same. So, what, exactly, is the criteria? Do you have to believe in a certain religion? But what if you are not exposed to that religion or simply struggle with believing in it? Do you have to be a 'good person'? What if you were a terrible person, but you believed you were doing the right thing? And, if the criteria is simply being a good person, shouldn't you do it simply for the sake of being a good person, not for the sake of going to heaven?
I don't know; this is just something I've always wondered and never heard a good answer for.