This is what I don't understand about these atheies and aggies. If they are so convinced that they are right and God doesn't exist or you can't ever know that He exists, why do they spend so much of their time so zealously trying to destroy belief in Him? I mean, if it doesn't exist, why bother? Just go about your business and live your life and leave others alone, whether they are mistaken (in your opinion) or not. That they spend so much time trying to tear down others' faith sends a message that they are either don't believe their own message, or they are afraid they are wrong and are desperately trying to convince themselves that they are right by ruining the faith of someone else.
It’s because most athiests aren’t really athiests at all, per the definition of not believing in God. They wholly belive in God, they are just against Him. A better, more descriptive, term would be anti-thiests.
As for agnostics, I claimed to be such for quite a time. Most of all, I was misguided with anger.
There is some emotional thing going on with them. If they were operating out of pure reason, it wouldn't make any sense to spend any time trying to 'undermine Christianity'. . .that is, if they truly believed that God does not exist.