Let’s talk about absolute morality, again. Let’s assume that it exists. Let’s assume that there ARE things that are absolutely good, let’s say… killing people who work on saturdays… and things that are absolutely evil… like being gay…. and absolutely doesn’t matter (neutral), like…. erm… keeping slaves… Completely random examples, of course, I am not looking at any specific religion here… (suuureee)… So, the big question is… How do you know?
The simple answer is: You don’t. Obviously, people cannot agree on what is wrong or right. The pure existence of absolute morality does not imply that we also can KNOW what it is. In other words, we are back at square one, where morality, in the end, is just a choice. People who don’t believe in absolute morality at least admit that – but people who do believe in it, ALSO have to choose. They have to choose what they want to believe absolute morality is. Is slavery against absolute morality? Your choice.
Of course, the most boring answer Christians tend to give is, that every person „feels“ the „real“ absolute morality, just some people ignore it. Let’s be brutally honest here: That answer makes you a condescending moron who fails at being a decent human being. Stop it. Start accepting that other people are real persons, with their own thoughts and feelings. By trying to claim that you know better than them what THEY feel deep inside, that deep inside, they share YOUR view, you only admit that you don’t give a rat’s ass about other people, that you live in your own world, where no other person really matters, only what you think how these persons ought to be. Same thing as „everyone feels god exists, some just don’t admit it“, by the way. This is just admitting that you are not interested on a discussion, because for a discussion you first have to accept the other person – but with this sentence, you refuse to do so, you try to dictate what the other person is, try to take the other person’s mind for yourself. And that is, honestly, despicable.
How do we know what absolute morality is? It can’t be a democratic process – „If X people agree, it’s part of absolute morality“ – because then, it changes. So we will always have different opinions about absolute morality and everyone who claims that HIS personal opinion is the right one, is just some random guy. So, in the end, absolute morality can’t be known. It’s a choice. And by not accepting that simple truth, you even lose a useful basis for morality, as simply choosing one and claiming it’s absolute does not make much sense.
Claiming that there is absolute morality and claiming that you know what it is, are two different things. The first one might be an interesting philosophical idea. The other is simply claiming „I am right!“.