I answered your other question - hope it helps.
Faith and reason are completely different sets of thinking.
Faith means you believe something without in anyway having any evidence for it - you can't prove god, and you can't disprove god.
Reason is a chain of thought from one truth to (hopefully) another truth.
Science is a tool that uses reason and empirical observations and tests and controlled attempts to prove a reason-related-statement.
Praxeology is a chain of reason that uses statements that are true but unprovable to lead to conclusions.
All of these ways of thinking have uses and proper fields, and all are separate.
Trying to use reason to prove that a god exists is about as pointless as pointless can be. Trying to use reason to disprove god is also pointless.