Let’s think practically. A buried body decays. If left entombed long enough it will crumble to dust. “The dust returns to the earth as it was, and the spirit returns to God who gave it” (Eccles.12:7). Can God raise the dead from mere dust? Considering it’s what he used to make Adam in the beginning, we can safely trust him to do so on resurrection day. Burning a body simply speeds up the process. “Ashes to ashes, dust to dust.” If burial is what really matters, couldn’t we cremate a body then bury the ashes? If not, why not? We know it cannot be that a body must be more or less intact when Jesus comes back, because I assure you, there is likely nothing left of Abraham’s body but dust, and the bodies of the saints who lived before him have surely crumbled away by now. Is it the tomb itself that matters? If so, what about those lost at sea? Over time their bodies are dissolved into the waters and dissipated, yet the Bible says “the sea gave up the dead who were in it” (Revelation 20:13). Ashes scattered in the wind are no different than bodies dissolved into the sea. God can raise them both on Judgment Day. The condition of a corpse cannot thwart God’s power to raise the dead. All the dead will be raised (1Cor.15:52), those buried, lost at sea, devoured by wild animals, and those whose bodies were burned.
We see cremation poses no problem for God’s power to raise the dead, but we still need to know if it’s morally right. There’s no doubt traditional burial is normal in the Bible, even commanded in one case (Deut. 21:22-23). We also read of cases in which burning a body was seen as dishonorable (Josh.7:15, 25; 2Kings 23:20). However, Paul recognized someone may “deliver up [his] body to be burned” as an act of love (i.e. being persecuted to a fiery death for one’s faith), and it be a means of spiritual gain, so we must conclude it isn’t inherently sinful for one’s body to be burned. Among Bible believers there’s a tendency to associate cremation with heathen practices, or to shy away from it, because it makes us think about hell, but there’s no command against cremation in Scripture. The bottom line is it’s been left to spiritual liberty. Each believer must decide for himself. For me, I prefer Jesus comes first, but if he delays until my death, and if I have any say in it, it will be traditional burial for me, but if you opt for cremation you haven’t sinned.