I'm a strong atheist. I have been for forty years, since I was about 15, despite growing up in a very religious family and being forced to attend church - what a horrible waste of time. I never believed at any age.
I'm just following the evidence. It is beyond belief that I can experience my self at this particular moment in the infinite time that has probably ever existed and will probably ever exist, but I never experienced my self before my current existence and can never experience this self ever again after I die. As I wrote above, it is mathematically impossible that this just so happens to be a moment where I can exist.