If you believe he does, consider this:
We probably still have much to learn about what happened in Paris last Friday night, but there is one thing we can be 100% certain of. Before those bastards started out on their mission, they would have prayed to God. They would have asked for his full support for what they were about to do. They probably prayed while they were spraying bullets into people's bodies.
Given that they killed more than 100 people, injured hundreds more, caused panic and chaos and have achieved incredible press coverage, nobody can argue their mission wasn't successful.
So, if god does answer prayers, just whose prayers did he answer that night?