If I don't believe in a God that is my business and no one elses
If I am walking down Queen Street on a friday night just trying to have a good time with mates and then another freaking christian leaps at me with his bible out... then I will defend his attack on my beliefs, or lack there of.
Yes you are right. I do have a lack of belief in his existance.
But Christians have a lack of proof.
When there is proof I will admit I was wrong gracefully and accept the new truth...
However seeing how christianity is worded in a way which makes belief and faith the only way to get into God's good books then there will never be proof. Because undeniable proof would deny your faith once you KNOW god exists, therefore you would go to hell.