Because it works?
Even animal packs that live together don’t go slaughtering one another just for the heck off it, why? Because it’s easier to survive that way & be better off. Our ethics & morality evolve.
Even before the Bible was written people already figured out that “thou shall not kill” makes sense; & they “got the idea” not because a magical fairy told them.
Bible talks a lot about stoning people; I don’t see Christians going around doing any of that… anymore.
God invented sex and laughter. Are you sure you are making a wise choice?
You do know that at least according to the Bible in the new Jerusalem after the 2nd coming people will be like angels + no marriage, which is largely interpreted as “no sex for you”.
you don’t want to be happy for ever?
No. Happyness sucks without the bad times to compare it too.
To the OP; what YOU WANT will have no effect on what will actually happen, but I understand what you mean.
PS: which denomination of Christianity believes that there is either heave or hell/nothingless/nonexistence & you don’t exist anymore? Wasn’t that Catholicism? I keep forgeting, so correct me if I’m wrong.