They use it to criticize Islamic and Jewish beliefs as well, just not in this site as not to side with the Christian Majority.
I definitely don't think atheists tell people that God isn't real to affirm it with themselves. Otherwise, we'd have people making the same case to convert Christians to Muslims.
I don't think I deserve anything from God (if he exists). If anything, I am, for the most part, very content with my life.
What if someone dies through God's purposes? Let's say, for example (totally not from some video I saw), if God is real and as loving as monotheists perceive, that a train crashes and nearly everyone dies, excluded for this one baby. Many will jump to the conclusion that the baby's survival was a miracle caused by their beliefs. However, they conveniently forget that the people who suffered on the train didn't get any miracles, let alone the fact that the baby grows up and gains survivor's guilt after finding the out about the train crash that spared them. Imagine how someone could exploit the person's guilt and survival to turn them into a believer. Is it Christ doing the talking, or is it the priest doing the talking?
Happy Thanksgiving. :)