I would definitely go along with Marc & Say by far the best book to read if you're interested in the Science / Skeptic aspect is Carl Sagan's "Demon Haunted World". It isn't technically an "atheist" book, but it gives a great foundation to recognize BS in all forms & to defend your skeptical position. Welcome!!
You could try the Skeptics Annotated Bible
I also have a link to Carl Sagans "Demon Haunted World" in PDF format which you can read for free and is legal, it wiil take a liitle while to load but is worth the wait
Kaila- You have made a huge transition, from believer to skeptic, and it sounds like you've just made this known to others quite recently. An important thing to keep in mind is that you really don't have to argue your position to anyone. If someone brings up your atheism, and you don't feel ready or prepared to discuss it, it is perfectly acceptable to say, "I don't really want to debate this right now." It is your choice. Also, if someone presents an argument to you, and you don't feel prepared to enter a debate, it is also OK to tell them, "You've brought up an interesting point. I'd like to take time to ponder that." Not all atheists are chomping at the bit to disprove religion. Not all are sitting around waiting for a debate. To be an atheist simply means you don't accept the idea of there being any gods.
You might also consider looking at Bart Ehrman, I know other people here have already mentioned him, but this is a link to his own multi-media page (which does need updating unfortunately) and he does go into some detail about common Biblical fallacies.In both video and audio formats
A book I really enjoyed is "Biblical Nonsense: A Review of the Bible for Doubting Christians" by Jason Long.
I'm just reading Brothers Karamazov by Dostoevsky, who was no atheist. But on page 133 (of the Wordsworth Classsics edition) the illegitimate brother Smerdyakov, learning the scriptures, speaks out at last, like Balaam's ass (which is what they call him). "God created light on the first day, and the sun, moon and stars on the fourth day. Where did the light come from on the first day?" He is beaten for this clear thinking.
Even the committed believer has doubts, and your family have doubts too. They will plaster over them with the word "faith" which simply means belief without proof. I suggest you point out that you share their doubt and have chosen not to believe without proof.
Welcome, Kaila. Another resource which no one has mentioned yet, and one that I found very helpful is the website at: http://whywontgodhealamputees.com/
I am also in the process of reading all I can on this subject and for the same reasons. I would like to suggest two starter books for you.
For Science questions, I really liked "The Magic Of Reality by Richard Dawkins. He makes the difficult subjects a lot easier to understand.
For bible discussions, Bart D Ehrman has several great books. You should read is biography. It's amazing. As a starter, I recommend his book "God's Problem" (How the bible fails to answer our most important question, why we suffer). Lots & lots of good pointers in there.
You can find plenty more by doing a search at Amazon.com.
Hope that helps.
You are going to think that Im just kidding, but I am not, at least not 100%: the bible is a pretty good book to discover the non-sense of the christian god, and how human is deity itself.
Yes, a large number of us I believe, who "turned", did so because we read the bible starting from page 1, instead of hearing little snippets here and there. To me it's like reading "Mother Goose" or "Grimm's Fairy Tales" in older English than Shakespeare. In fact the only way I see one remaining or becoming Christian by reading the bible (or any other religion/religious text, I suspect) would be not reading it properly or being a tad insane.