For me it was because of the education program. the bible only became interesting in high school, because then we started to actually analyze the text and see the possible messages behind it (for example, we've analyzed the contradictions in the text, and learned many different interpretations to the possible meaning behind stories such as Noah's Arc and the Tower of Babel). In elementary and middle school, it was just treated as a very boring story.
Thankfully, the religious and non-religious waves are seperated in the education, so the amount of bible classes in my schools were fairly minimal compared to the religious schools. (and we've never had any teacher who was religious, so they didn't force us to believe in any of this)
