"Faith is believing what you know ain't so." - Mark Twain.
What good reason is there to accept the fantastic claim that Jesus existed as told in Biblical mythology?
Science asks for evidence and rational discourse of religious claims, particularly in so far as they affect the natural world and the effectiveness and efficiency of scientific discovery and research. Religion hardly wants the same of science. Science cannot operate on the same kind of "faith" that religion thrives under because it is without reason or logic. The sort of faith present in science comes through evidence and tested hypotheses.
Faith in an imaginary, magical being (i.e. Jesus the alleged christ) is blind faith.
Faith that f=ma is the same as a=f/m is faith in the observable; the testable; the verifiable. This is the kind of faith that allows us to sleep on an airplane at 32,000 feet.