Reddit mentions of World Religions: The Great Faiths Explored and Explained

My interest is comparative religion, and for people who want something easily digestible I always recommend The World's Religions By Huston Smith, and World Religion by John Bowker. Both are great for beginners, but not boring for someone a bit more advanced. The second one is a good coffee table book or something to just flip through, with lots of pictures of ancient art with great captions and little facts in the margins.

Literally 30 seconds on Amazon (Subject: History, Keywords: Religion) gives a ton of good-looking books:

Of course! Comparitive Religions for Dummies

Huston Smith is a fairly famous writer in this area: The Illustrated World's Religions

Nat Geo should be neutral: National Geographic Concise History of World Religions

By the author of the Oxford Dictionary of World Religions, World Religions: The Great Faiths Explored & Explained

While you may get good suggestions, ideas here, you're not going to find what you're looking for. YOU are the only person who can decide what you believe and why you believe it.

I suggest taking a World Religions course at a local community college and learn the basics of all religions. Go to different churches, mosques, temples and read as much literature as you can.

There are few concrete facts when it comes to religion or belief in God in general. You have to go with your heart, and allow yourself the freedom to believe or disbelieve. The only way to do that is to inform yourself.

This is a good book to start:
http://www.amazon.com/World-Religions-Faiths-Explored-Explained/dp/0756617723/ref=sr_1_1?s=books&ie=UTF8&qid=1342803241&sr=1-1&keywords=religion