How can it be conceived that the bodies of some Christians remain intact and emit a pleasant odor after their death, despite our belief in their disbelief, knowing that the earth consumes only the bodies of prophets?

If what was mentioned is proven by a reliable method, it does not indicate the faith of Christians or their salvation in the Hereafter. For Allah may preserve something of their bodies for a wisdom, such as preserving the body of Pharaoh as a sign for people. It is not improbable that the deceased might have secretly embraced Islam out of fear for themselves, and then was granted a good end, resulting in a miracle appearing on their corpse. The hidden faith of some people is a reality, as mentioned in the Almighty's saying: "And were it not for believing men and believing women whom you do not know" and "Except for the oppressed among men, women, and children who cannot devise a plan nor find a way."