Depends on whether the atheist is a tolerant atheist or a Zealot
Yes, there are atheist zealots. The kind of people that get up in the face of somebody that believes in God to argue they are right and the religious person is a fool. I've met a few atheists more fervent and zealous in their non-belief than any Christian, Jew, Muslim, or Hindu. And in general, they act like a d*ck