I'll be 21 next month. I think I've been atheist my whole life, and didn't know it. From a Catholic family. Luckily, my parents are not involved in the religion.
My parents believe in God, but we don't go to church, say grace, have a bible, etc. We only do religious things on holidays like Easter and Christmas.
I went to CCD from a young age, and got confirmed in 8th grade. I was so happy to get out of there. I went to a public school; this was an after school program.
NOBODY actually liked CCD. Kids I knew from school went there.
My first skepticness was at my holy communion. I found out the "blood of Christ" is just wine. I thought to myself, "Where do they make the bread?"
I did believe in God. But I did not give a s**t. To me, Christmas was always about being with my family, giving and receiving presents, winter, etc. Easter is about Easter eggs and candy.
I used to fear the devil. Then I outgrew him in middle school. Now, I can't take people seriously when they believe the devil is out to get them.
I was taught to fear God.
This is how the God of Catholicism and Christianity is:
"Worship me, or burn! Here are my rules, and things you're not allowed to do! Do not live for yourself! Only live for me! It doesn't matter how good you are, you're still doomed for hell! You deserve it, because you were born an evil sinner! No being gay, no mixing fabrics, no enjoying yourself, no rock or metal music, no knowledge, etc. Love me more than your parents! You are not permitted to question me or my power or existence! But don't worry, I still love you!"
It was just bullshit. I believe Jesus was a real person. But Son of God? No. Born from a virgin? No. Walked on water? No. Turned water into wine? No. Rose from the dead? No.
Another thing: If Jesus was God and The Lord, and if God was real, it would be a fact that everyone would know.
The sun is a star. Sickness is caused by bacteria and viruses, even genetics. The earth is round. "God is real" is a CLAIM, not a fact.