you don't have to believe in a god to be a good person or believe in an after life, being a good person is about how you are with othrs, not stressing/hurting them, being good etc , not believing in a god and believing in an afterlife comes from experience of loved ones deaths and your own logic/beliefs. the afterlife may be heven and hell for some but others have differing views, they are all valid to the individual.
i gave up all belief in God years ago, after coming to the conclusion that igod is a very sick man/woman/spirit/whatever. after all he would not make some really good people go through so much sxxt and let axxeholes sail through life without a care if he weren't sick sadistic or enjoyed watching the good of the world suffer as they do.
I was once told god only gives you what you can handle.. if that is so how come so many people become mentally ill/unstable due to the stresses they encounter in their lives and how come so many good people end up suicidal or worse because of it.

but my greatset reason is that no one can give a logical tangiable explination as to who is gods father or where he came from or where he got the idea of building the world .. no one has seen the blueprints of how he mades humans or why he made things that hurt humans like killer snakes or sharks or why he gave humans the capacity to build things that kill other humans!! I understand the circle of life and how it works , but i am sure he could have come up with the same thing without involving stress to stay alive!

and if god is watching over you every day in everything you do why is it people think you have to go to church to say hi to him every sunday!