I believe we can answer yes to the first four of these questions about the existence of God but not to the fifth. God exists, we can know that, we can give reasons, and those reasons amount to proof, but not scientific proof, except in an unusually broad sense.

There are many arguments for God's existence, but most of them have the same logical structure, which is the basic structure of any deductive argument. First, there is a major premise, or general principle. Then, a minor premise states some particular data in our experience that come under that principle. Finally, the conclusion follows from applying the general principle to the particular case.