I believe that a person is a physical being and has a core spirit. This has been labeled many things in many cultures but for this conversation, I will refer to it as a persons spirit.
Religion has been one of the greatest unknowns and/or confusions, due to the way I was raised. I grew up in a family of Assembly of God Pentecostals. For Generations the family has been pastors, missionaries, etc.... in the church. I too was brought up in this traditional family structure. As I got older I questioned the entire concept of religion. The hypocrisy was more than I could excuse. So I started looking at other religions and the beliefs of other cultures.
There are many religions thousands of years older than our North American version of the divine and afterlife. Also having an interest in space and astrophysics; keeping up with the advances of understanding of the Universe, I have come to a personal explanation of the afterlife that gives me a since of peace about this subject.
Simple explanation:When contemplating the Universe, space, time............ the one thing that is clear is that "infinite" is common in Universal contemplation. "Infinite" is the common thread tying all bonds to this space that we occupy. 
Well, with "infinite" being so common, how can there be one answer for the afterlife? It just doesn't fit. So, it seems just as likely that there might just be "infinite" answers to the question of the afterlife.
What if the spirit that resides inside each one of us continues on in whatever state the believer believes. Say the Christian that believes in his/her core being that when they die they will be walking the streets of gold, in Heaven with Jesus Christ for eternity. 
It could also be just as plausible that the Buddhists could experience the things in the afterlife they spent a lifetime preparing for. It could also mean that the Muslims would achieve their place in heaven with their prophet as they see it. This would mean every person that has ever lived has and will achieve whatever they believe in their core of cores, in their soul of souls in the afterlife.
This is just as likely to happen as any other explanation of religion and the afterlife. Because of "infinite", anything is possible. 
This is what gives me peace in my spirit, having an inability to have faith in any established form of religion. I would not claim to be an atheist, I don't know a definition to what I am. An atheist would believe that when they die, the experience of the spirit is over when the heart stops beating. I believe the spirit continues on.
In my spirit I have a quest for knowledge. I would like my spirit to continue learning all of the things we as earth bound beings will never even be able to come up with the questions to ask.
I am at peace with my eternal existence.