There have been a number of threads recently that have touched on this topic recently, and I thought the conversation deserved its own place.

My default worldview for the past decade+ has been something best characterized as naturalistic or materialist (the totality of reality can be explained by material and its interactions.) I've had a few things challenge this view recently, namely the "Hard Problem of Consciousness." I'll post my own comment about what moved me from hard materialist to agnostic on materialism, but I encourage you to post your own reasoning in your comment!