Millie210 - Why does the burden of proof automatically rest on the side of the theist?
First of all, thank you for you kind words. I get the above question all of the time. There are a number of great books and articles on logic and epistemology that can provide better and more detailed answers that I can, but here are some ways to think about it and get you started:
When debating an idea or issue, the burden of proof rests on the party making the positive claim. This is a basic tenet of various schools of philosophy, logic, epistemology, etc. One of the reasons for this approach is that it helps deal with possible logical fallacies (e.g. Argument from Ignorance). Another reason, is that it is more practical than the reverse. Imagine how many years and resources and money you would have to spend trying to "disprove" every claim that is made (e.g. God, fairies, Loch Ness monster, etc.). You could chase your tail forever. Instead, it is more logically consistent and useful to have the person "adding something into the mix" (or making the claim) to provide evidence of their proposition before it is accepted.
On a side note, most people are perfectly happy to have the burden of proof on the person who makes the claim in just about every area in life except when it comes to God. For example, if I told you that I have a miracle cure for some disease and all you have to do is give me all your cash, would you ask for evidence to prove it or would you spend your time and effort trying to prove me wrong? We do this every day. We put the burden of proof on the person making the claim, except when it comes to our particular pet beliefs and especially when they deal with God. Weird, right?
Lastly, this approach is used successfully in a number of areas include the legal system, the scientific method, etc.