A lot of the topics on boards like these are done to death (like the problem of evil, epistemology of religion and free will). But they are places where I seem to learn most philosophy as for me books seem to be easily forgotten if not applied to debate. In any case if you are looking for motivation and are secularist I heard that most advanced philosophy students tend to be non-theistic so what better way to probably deconvert me than by teaching me philsosophy? Anything except logic will do. No ironic remarks please.