Or, you could take one of these tacks:
1) The existence of Raise Dead, Resurrection, and True Resurrection might lead a culture to have a belief in the eventual resurrection of all. A more limited version would be "the worthy". Wealthy people would spend a great deal of time and money to constuct elaborate tombs in which to preserve their bodies for their eventual resurrection. Destruction of the body could/would be sacrilege in such a religion. This would also be why animating the dead is considered Evil - it denies the departed their chance to come back.
2) The plane where the departed wind up is a sort-of mirror of the material. What happens on the material affects what happens in the afterlife. Destroying the body of the deceased ends the afterlife. Thus, again, an incentive to preserve the body, and a reason to consider necromancy Evil (it causes agony to the departed).
In my homebrew, cultures with a religion with Clerics (or other priestly types who have access to Raise Dead, Resurrection, and True Resurrection {note: such access is scaled back to 'miraculous' in my world}) adopt a viewpoint similar to those. Druidic faiths, which have Reincarnate instead, do not place as much emphasis on the body, and do practice cremation. Less savory races, which generally have less respect for the dead, make use of the deceased in various ways.