First and foremost, I believe that rationality is the only route to truth. So, I became an atheist and studied science. (In my case, these are connected. However, they are not necessarily connected.) Creationists and fundamentalists drove me to anti-theism.
Second, I think that secular humanism is the only hope for peace, and that compassion is the best criterion for assessing morality. So, I have became anti-religion.
Fundamentalism is a menace on the planet. It is a menace to its adherents. It is a menace to non-adherents. It is a menace to life, limb, emotional-health, and rationality. Fundamentalism, and its supporting religions, have to go.