Arrogance and Atheism

When I realized I was an atheist and finally had the courage to announce it publicly, my Christian friends (who were about to end their friendships with me) accused me of arrogance.

“How arrogant of you to claim total knowledge of the universe and say God doesn’t exist.”

That’s arrogant? As opposed to not only claiming that they know for sure God exists, but that they know what this God wants everyone to do with their sex organs, their Sundays and their lives? And to know that every other religion that’s ever existed on the planet is and has been wrong and their followers are going to hell when they die? That’s not arrogant?