I grew up with both my parents being practicing, devout Christians. I was obligated to go to church by them for years, including mass and all that.
I believed for a long time. Perhaps I was fifteen or sixteen? Anyway, I soon realized that there's not much evidence supporting God's existence and don't even get me started on the religious aspect. I found there was much to be critical of and little good that came out of religion, it's dogma, and it's influences.
I still continued to go to church after I stepped out of the realm of belief because I had an abusive mother who gave me the option (if you want to use that term) to go to church or be kicked out onto the street.
At this moment, I consider myself antireligious and an atheist. My thing is that a God/Gods could exist but it's irrelevant to my personal beliefs because those require sound evidence, something that I find is lacking in terms of the presence of a God and/or Gods.