From an article by Sam Harris at the Washington Post in the On Faith section Harris details how to trick oneself into believing in something that rationally cannot exist:
How to Believe in God
Six Easy Steps
1. First, you must want to believe in God.
2. Next, understand that believing in God in the absence of evidence is especially noble.
3. Then, realize that the human ability to believe in God in the absence of evidence might itself constitute evidence for the existence of God.
4. Now consider any need for further evidence (both in yourself and in others) to be a form of temptation, spiritually unhealthy, or a corruption of the intellect.
5. Refer to steps 2-4 as acts of “faith.”
6. Return to 2.
Like Harris says, this method has worked for billions, and it will work for you too.
Giving up my god-belief wasn't as hard for me as some because I never saw what was noble about believing in childish things like the virgin birth or the resurrection. I remember being embarrassed for the people who would walk up to the preacher to accept Jesus. Jesus was the same as Santa Claus or the tooth fairy to me, just as unbelievable and just as silly. When I experience that arrogance from some of my super-duper religious relatives I have to cringe inside. How does believing in or having faith in something so incredible make them better than me? It doesn't. To me they seem gullible and a bit dumb. There's nothing noble about that.