[ars]

No, there are no absolutes.

Lets break it down. Is killing children always wrong?

In many countries it's legal (today) to kill children. In some cultures surplus children were left to die of exposure (Sparta for example).

And once the child is dead - well some cultures eat the dead as a form of burial.

There goes your absolute.

Just so you know: it's not possible to create a moral system from first principles. It always has to be imposed from outside. In most countries the bible serves as the starting point.

If you want, you can have one guy decide, and use his ideas. But you can never defend them as absolute and correct. Another person, just as logical, can come up with conflicting ideas, and you can never prove one is right and the other wrong.