How sound is the story of the polytheistic woman who was burned by a dazzlingly white angel with sparks and taken by him to heaven, and whose son’s face was burned when he turned to look at her, and can a dead person ascend to heaven in this manner?

The story mentioned is not found in the references; it may have been fabricated by storytellers. Shirk (associating partners with Allah) is the greatest of sins, and it is the only sin that is not forgiven for its perpetrator if he dies upon it, as Allah Almighty says: "Indeed, Allah does not forgive association with Him, but He forgives what is less than that for whom He wills," and His saying: "And whoever associates partners with Allah - it is as though he had fallen from the sky and was snatched by the birds or the wind carried him to a distant place."