A Challenge to Theists

I am extending a challenge to all theists (Christians, Theistic Buddhists, Ba'hai, Muslims, Jews, etc.):
Rationally explain why you believe that there is a deity. Using accepted logic (for a list of fallacious arguments, go to fallacyfiles.org), define each step along the way that provides you proof as to the existence of a deity. If you quote from a source (Bible, Qu'ran, Torah, etc.) as a method of supporting your arguments, give a rigorous explanation as to why the source is valid to quote from without using any tautologies. Be sure to quantify all concepts and axioms that may be vague, arbitrary, or otherwise appearing to be illogical.
If you can beat my logic with better, rational logic, I will concede that there is a god.
For a bonus, if you can present to me evidence that would prove your religious ideology to be the most rational, I will not only accept your religion as the more rational philosophy, but I will argue for it whenever these debates come up.
However, if you cannot overcome my challenge, you must explain why you still hold on to your beliefs, in face of overwhelming intellectual odds.
Rationally explain why you believe that there is a deity. Using accepted logic (for a list of fallacious arguments, go to fallacyfiles.org), define each step along the way that provides you proof as to the existence of a deity. If you quote from a source (Bible, Qu'ran, Torah, etc.) as a method of supporting your arguments, give a rigorous explanation as to why the source is valid to quote from without using any tautologies. Be sure to quantify all concepts and axioms that may be vague, arbitrary, or otherwise appearing to be illogical.
If you can beat my logic with better, rational logic, I will concede that there is a god.
For a bonus, if you can present to me evidence that would prove your religious ideology to be the most rational, I will not only accept your religion as the more rational philosophy, but I will argue for it whenever these debates come up.
However, if you cannot overcome my challenge, you must explain why you still hold on to your beliefs, in face of overwhelming intellectual odds.