And IMO there shouldn't be! The whole point is that faith is defined as "belief in things not seen"--whether they be "seen" by the senses, or through the light of reason.
I have a dear friend who is involved with something called Reasonable Faith. To me, that's a contradiction in terms. The essence of faith is that it not be reasonable, as the term is usually used: If the existence of god(s) could be proved, then it would be a matter of rational conviction and not faith at all!
Moreover, as soon as a believer asserts that there is a rational basis to believe in god(s), s/he is likely to be asked "prove it"--and at some point the proof will beg the question (that is, assume what needs to be proved), or s/he'll say something like "God's logic is not our logic," which precisely undercuts the contention of there being a rational basis for belief (because "rationality" is based on human logic).
To me, faith is the essence of religious belief: "No, I can never prove my god exists, not even to myself--yet I believe!" That, I think, is being intellectually honest--and is unanswerable.
All the best to everyone, and thanks for all civil posts. I doubt this thread will last much longer.