As a fellow atheist, I live my life openly secular and unafraid. It was not an easy transition, but it is far more rewarding. You have resources available; the Freedom From Religion Foundation, Recovering From Religion, the Foundation Beyond Belief, months' worth of podcasts, Facebook pages, the list goes on!
The atheist and secular movement is growing like wildfire and now is the best time to come out. If you are in any kind of danger the SAFE program can help you with information, or The Hotline Project can help you by giving you secular people to talk with. You are NOT alone. Go to youtube and look up the TSreet Epistomology series and look at how people engage believers in conversation, using a Socratic method of conversation to to get them to talk about their beliefs, and even Atheist Bible Study can be found all over the place on shows like The Bible Reloaded, Dogma Debate with David Smalley, whose secular media group also hosts audiobooks.
Do not let your surroundings get to you. Reach out to other people in the secular movement, start writing or blogging about your experiences and post it online; share your life and your perspective. There is a LOT to do.
If you want to discuss this further, my inbox is always open at blahtherapy/com/members/blackholehead