Agnostic here, and pretty much never thought any organized religion had much of the truth.
When I was a child of around about 10 or 11 years old, my stepfather persuaded my mother to send me to Sunday School and get indoctrinated in the genteel Methodist Church which my stepfather resolutely skips every Sunday. I fancied myself something of intellectual prodigy at the time, and detested my stepfather with the white hot, absolute rage of which only children and psychopaths are capable. So, I took this as a challenge. Within 4 or 5 weeks, I had checked out every book in the church library I could find about non-Christian religions. Then, I checked out books from the public library on other religions, and decided that I would convert to Islam. Well, not really Islam, per se, as much as a version of the Nation of Islam (think Louis Farrakhan, Elijah Muhammad, etc) that I could apply to myself despite being about as caucasian as possible. So, two months into the Sunday School experiment, I'm calling myself "Abu Jamal X", bowing down to pray towards Mecca five times a day, and greeting everyone with "As salaam aleikum". I did not have a third month of Sunday School. I stopped being a "Muslim" within about a month or so of the Sunday School experiment ending.