Why do you believe, disbelieve or practice what you do?
You can approach this question from a causal perspective (What caused you to believe/disbelieve/practice.), or you can approach it from an instrumental perspective (For what purpose do you believe/disbelieve/practice), or from both.
Because you’ve examined facts and arguments, and this is simply what you’ve concluded is most likely true?
Because you want to believe?
Because it helps you live a better, more fulfilling life?
Because you want to get into heaven or avoid hell?
Because you want to live a sinful life?