Insofar as a great deal of filmmakers are Christian and influenced at the very least by their upbringing even if they are not practitioners of a faith as creatives, there's tons of Christian movies that aren't terrible.
As stated in the OP, I think what separates the good from the bad is the bad set up a straw man to knock down, and whatever you think of religion that's just not good storytelling. It's designed not to tell a good story, or convey a viewpoint, but primarily to satisfy an audience's ideological biases. From a creative standpoint that's throwing you into the ocean with a millstone and telling people to make it to shore.
Speaking from my own personal background, I'm partially really interested in Silence because it seems like if there's a subject Hollywood is as terrible at depicting accurately as hacking in movies, it's probably Catholicism (the number of films where they can't even get a guy to perform the sign of the cross correctly is mind-boggling.)