I won't hazard a guess if he believes in God. God and faith are not photo-ops. They are deeply held and lived accordingly.
I will say though that he cannot believe in the Catholic faith if he refuses to uphold its tenets.
#1: Describe a partial-birth abortion
#2: Say that is an acceptable practice for a civilized society
#3: Say that you can support that and remain a communicating Catholic.
There appears to be some wiring (of some kind) missing between Mr. John Kerry's ears.