Because we are expert in intuiting what you are trying to say, vs what you write. Always trying to make sense out of the universe using reason and evidence.
Why do you consider it bad? Is your head buried in the sand? Are you blinkered? Do you blindly follow what your church tells you is true? Do you bother to question and think for yourself? ARe you scared of viewpoints that disagree with what you hold to be the truth. Is faith more important to you than TRUTH?
I can only speak for myself and I'm here because someone should stand up to lies. As for 'bad words' most of them come from theists actually, especially in my email.
Speaking of "bad words", which is worse, someone who says god dammit, or someone who actually believes in a god who damns people, and teaches this as fact to little children?