A question about Atheism…

I have lately been having a lot of thoughts and questions about Atheism… Its kind of confusing but here they are…

Is belief in God and belief in the existence of soul(s) different?

My thinking is that if one believes that each person has a soul, then (s)he believes in a (finite/infinite) cycle of life(and death) or believes in heaven/hell which I feel are very close to the belief in god. The definition of god is very vague(omnipotent, omnipresent etc.) but then why is it much easier to accept the belief in a soul(which is pretty vague in its definition too).