1. Not a believer. I'm interested because I have friends who are and it's just generally interesting.
2. Kalam or fine tuning. They have the most intuitive appeal, and they implicate lots of philosophical issues.
3. Problem of evil or potential inconsistencies in the definition of theism.
4. Not a scientism-ist. These sorts of questions are inherently philosophical questions, not scientific ones.
[See summary page of this discussion, with links to all the posts, here.]