Not only does the atheist profess his disbelief in the existence of God, but goes out of his way to convert those who do to his way of thinking.
He will use ad hominem attacks against those who have faith and beliefs, questioning their sanity, their intelligence, etc
Evangatheist: You're nuts for believing in God. You're deluded. You should drop your silly beliefs. Your faith is unfounded and unproven and impractical. Your head is full of 'theo(logical)-toxins' and you need to be cured. You can't be very intelligent to believe in any Supreme Being.