What is the religious ruling concerning a Muslim born in America who committed suicide while ignorant of his religion, and what is the punishment for suicide in the sight of Allah?

Residing in lands of disbelief is a calamity, and ignorance of religious rulings is one of its bitter fruits, leading to serious consequences such as abandoning prayer. It is permissible to supplicate for one who has killed himself, for he is not an unbeliever, and his affair is under the will of Allah.