بسم الله الرحمن الرحيم
Every disbeliever who has heard about Islam through Prophet Muhammad ( ﷺ) and DID NOT enter Islam will enter Hell. If they worshipped someone other than Allah or didn’t even believe in a Creator in general (aethists), no matter how many “good manners” they had, they will not go to Paradise and will be in Hell eternally. The main purpose of this life is to worship Allah and that is the test, their “good manners” aren’t even good if they don’t even have any manners with Allah and choose to disobey Him.
“Verily, those who disbelieve (in the religion of Islam, the Qur’aan and Prophet Muhammad) from among the people of the Scripture (Jews and Christians) and Al-Mushrikoon will abide in the fire of Hell. They are the worst of creatures” [al-Bayyinah 98:6]
Every time a group is cast therein [into Hell], its keeper will ask, Did no warner come to you? They will say, Yes indeed; a warner did come to us, but we belied him and said: Allaah never sent down anything (of revelation), you are only in great error.
[al-Mulk 67:8]
And those who disbelieved will be driven to Hell in groups, till, when they reach it, the gates thereof will be opened (suddenly like a prison at the arrival of its prisoners). And its keepers will say, Did not the Messengers come to you from yourselves, – reciting to you the Verses of your Lord, and warning you of the Meeting of this Day of yours? They will say: Yes, but the Word of torment has been justified against the disbelievers! [al-Zumar 39:71]
However,
If the disbeliever hasn’t heard about Islam at all, Allah is the most just. Thea disbelievers that have died without knowing about Islam at all, will be tested by Allah on the day of judgement. If he obeys, he will go to jannah, if he doesn’t, he will go to Hell.
Allaah says (interpretation of the meaning): And We never punish until We have sent a Messenger (to give warning). [al-Israa 17:15].
In his tafseer (commentary) on this aayah, Ibn Katheer (may Allaah have mercy on him) said: These words, And We never punish until We have sent a Messenger (to give warning) tell us of the justice of Allaah, may He be exalted, and that He does not punish anyone until after He has established evidence against him by sending a Messenger to him.
Anyone who hears the message of Islam in a sound and correct form (and rejects it), will have evidence against him. Whoever dies without having heard the message, or having heard it in a distorted form, then his case is in the hands of Allaah. Allaah knows best about His creation, and He will never treat anyone unfairly.
And Allah knows best
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