What is the fate of a father who died of kidney failure and did not pray in the last six months due to his belief that his prayer was not permissible because of incomplete purification, and who completely lost consciousness 24 hours before his death and did not utter the Shahada?

Whoever dies as a Muslim is hoped to enter Paradise, and prayer does not cease to be obligatory for a Muslim as long as they are of sound mind. However, a sick person performs it to the best of their ability, and there is no sin upon one who loses consciousness. There is no obligation to make up the prayers they missed; rather, increase in supplication and charity for them. Not hearing the pronouncement of the Shahada does not indicate a bad ending.