Is it true that there is no absolute morality?

[Amarok]

Would you agree that everyone universally, regardless of culture, geography, etc; feels that it would be wrong to commit blank (insert the most heinous act propagated against children or humanity you can think of)?

No. And it is irrelevant regardless. What you refer to is consensus morality, not objective morality.

The latter remains an incoherent, undefined term.

Agreed there are arguments for objective morality but appealing to human universal feelings won't do it . As for the assertion of said universal it's never existed I fear human barbarity (often propagated by religion of justified under it because when god commands it can't be wrong ) seems boundless (as well as the contrary)