I was raised Pentecostal and I was very devout up until about age 15-16. I felt like I should know more about what God expects from me, so I read the KJV Bible cover-to-cover. Then I read it again in a Modern English version to make sure I was understanding it correctly. That cured me of being a Christian; however it would be about 20 more years before I gave up belief in God entirely.
I'm not anti-Christian. I'm anti-stupid.