I know that Allah sends Kafirs to hell according to many verses.
But can everyone who is said to go to hell according to Islam be considered/assumed to be a Kafir?
Also, do non-Kafirs go to hell?
For example there are many verse saying that idolators are destined for hell.
In some cases some group/category people may be said to be destined for hell and one might not find verses confirming they are kaffirs.
In the above case, can it be assumed that all people mentioned to be destined for hell in these verses are kaffirs?