The problem here is if creationism is true then many people will have to take responsibility for their actions. Why do you think they fight so vehemently against it???It's not an uncommon argument. "Atheists just want to do whatever they want (i.e. sin), without anyone judging them in the next life." No. We don't think there is any next life. We fight against supernatural beliefs because they are oppressive, counterproductive, and false. They are childish.
Rather, it seems to be that belief in creationism, afterlife, and God results in those people not taking responsibility for their actions in this life. Many (but not all) of them don't care what happens in this life, as long as they go to Heaven when it's over. And all the bad things happening in this world (pollution, climate change, wars, environmental catastrophes, death and disaster) are omens of Christ's return, and therefore not particularly something to fight against.
Besides, as a matter of fact, atheists and do take responsibility for their actions at least as much as everyone else. Atheists are at least as moral as everyone else. Atheist nation are more peaceful, church goers more likely to steal newspapers, and priests sin too.