When any theist can demonstrate any objective evidence for any deity or deities, and then demonstrate sufficient objective evidence for any moral absolutes, then they might have the basis for an argument from morality. Until then all they have is subjective assumption from morality.
Is there any context in which it would ever be moral to torture a newborn baby to death?
The biblical deity did this.
Is there any context in which it would ever be moral to buy or own human slaves, and to beat them, even to death as long they last 48 hours past the beating?
The biblical deity is claimed to think so in Mosaic law.