I agree with you, but some Calvinists believe that we are justified and that leads to faith. They believe this because; they mistakenly believe that if it is the other way around, it would show that we would have something to boast about.
I believe however, that if we realize that it is God that gives us the faith in the first place (Eph. 2:8-10) and that faith is not something that can somehow be resisted. Then the supposed problem that they see is resolved.

Does that make sense to you?
Tom