The Devil is a nasty piece of work - best not to make him seem a comic character or not take him seriously, or you may get to see him permanently.
I find this question a bit scary not because of what we can or can't do in this life, but because everybody dies, and by treating the devil or God as funny characters instead of the powerful beings they are, and that we will have to spend eternity with one or the other of them, we need to take our pick while we are still alive, then act according to our choice.