There are just three fundamental flaws in the logic on display here in this popular atheist slogan.
The word 'probably' means that they have stated that the existence of God is unlikely - but nonetheless possible! Doesn't that resonate better with agnostics?)
Secondly, if as implied, Christians aren't enjoying life - then surely they are doing something wrong!
Thirdly, I suspect that they are equating 'sin' with 'enjoyment'. As the atheist has no concept of 'personal sin' and consequences - perhaps they may be forgiven for what is their simple ignorance.
Even so. Three blunders in eleven words is not particularly good going - is it?
