Corwin - To say faith informs reason and vice versa is to say that faith provides the groundwork for using reason to determine other things and that reason provides useful bounds to what should and should not be considered an article of faith. This can mean that if an article of faith is unreasonable (i.e. to believe the particular item contradicts reason), then it should perhaps be examined. I should note, though, that reason is not bound by the empirical (as science is by definition), so to say something like "Christ is the Son of God", while it is not empiricially proveable, it is also not unreasonable, and thus is something that is an article of faith. This article of faith, then can be used to supplement our reason and give it something upon which to stand (i.e. if we start with Christ as the Son of God, then we can logically infer a number of other things). I will note that if you try to create a purely atheistic philosophical system (and by that I mean you can't steal anything from Christianity such as loving your neighbor as yourself or from any other religion for that matter), you are going to have a very difficult time doing so because you don't have anything on which to stand as a starting point (though that has not prevented some philosophers from attempting to do so).
I should also note on the science/religion topic that these two fields answer very different questions. Science is purely concerned with "how." Religion is concerned with "why." Science can not answer questions of why, and when it attempts to do so, it will always fail. As an example, if I were to ask why there is static electricity when I rub my feet on the carpet, then you could give an explanation about electrons and friction, etc. If I were to then ask about why electrons work that way, you might have further explanations with more detail, but eventually we would reach a point at which you had no answer better than "Because xyz is". For instance, why is there existence (matter/energy)? I can assure you with absolute certainty that science will not be answering that question ever, because it is not possible to do so empirically.
Religion, however, while it can sometimes give answers to "How" questions (for instance, how can I be a better person), is really about the "Why" questions. The question I just asked a minute ago about why there is existence can be answered by saying that God, in his infinite creativity and love, decided to create the universe and eventually us so that he could share his love with us.
Finally - I addressed things like geocentrism a few posts back, so I will not repeat myself on that particular topic.