This question can arise based on concerns about the resurrection and the “renewed body” that God will give us for eternity.
Paul states in 1 Cor 15:51-53, “But let me reveal to you a wonderful secret. We will not all die, but we will all be transformed! It will happen in a moment, in the blink of an eye, when the last trumpet is blown. For when the trumpet sounds, those who have died will be raised to live forever. And we who are living will also be transformed. For our dying bodies must be transformed into bodies that will never die; our mortal bodies must be transformed into immortal bodies.”
People who consider cremation are concerned that they somehow negate a renewed eternal body. While scripture does not specify how this will work or what it will look like, we can be assured in God’s power to provide a renewed eternal body, regardless of the condition of the old body. Cremation is not the only scenario where a body is not whole and it will not negate an eternal life. The decision on burial or cremation is ultimately a personal family matter and does not affect a resurrection body.