Atheism worships a dead god.

[Existentialist]

Non-existence? I thought we were talking about the infinitesimally small chance that atheism is wrong. If the Christian God exists then everyone has to face that reality after they die, not just atheists. Yet now you talk of God's non-existence effecting people. If he doesn't exist he doesn't effect anyone for he isn't there to do any effecting. If the Christian God exists it makes no difference whether you're an existentialist or not because everybody would be equally powerless compared to his will. What would happen if God existed? Whatever he wants to happen if he's truly omnipotent. It makes no difference whether we're an existentialist or not.

The existence or non-existence of God doesn't need to be quantified if you take the position that God does not exist and you seek to explore the full consequences of a consistently atheistic position, though I realise rationalist atheists like to think in terms of estimates of probability and instinctively place the probability of God's existence as probably very small, though I never see any calculations that back this up. And of course the idea of god's existence affects people, so the idea of his non-existence also has consequences not least as we emerge from a highly theistic social history. The existentialist atheist asserts that an existing god's omnipotence is his business, we have our own to be getting on with. The rationalist atheist subordinates himself to God the moment god's existence is proved. That's a pretty big difference.