Sorry, these are the kind of things you have to be willing to do some casual independent reading on. Or youtubing, if you can't handle dam letterz.
Look here, if you're wondering if there are any challenges to science being the only source of knowledge: http://atheistforums.org/thread-21091.html The very second post is an astute observation. Natural explanations are not the only explanations out there.
For a start, you could try hanging your hat on being logical. We'll move on from there.