Far from it. Passion for truth is passion for God. No wonder our Christian responsibility is to understand and be able to express what we believe and why. If you hear someone claiming to believe something but even after listening carefully it never becomes clear exactly what he or she believes, or why, you are surely entitled to wonder if the belief is valid at all. Unless our Christian faith includes this level of understanding, we are short changing ourselves.
People often misunderstand the rationality of faith.
They imagine that they believed in God because faith is rational - which it is. But they then expect every aspect of faith to be equally open to rational investigation - which it isn't. So when they come across the first mystery they can't understand, they conclude that the Christian faith is irrational after all. God has led them to believe it was rational, but now apparently he has cheated them by unfairly slipping in a mystery. What they forget is that rationality is opposed to absurdity, not to mystery.