When will the doomsday come?

They ask you about the Hour (Day of Resurrection): "When will be its appointed time?" Say: "The knowledge thereof is with my Lord (Alone). None can reveal its time but He. Heavy is its burden through the heavens and the earth. It shall not come upon you except all of a sudden." They ask you as if you have a good knowledge of it. Say: "The knowledge thereof is with Allâh (Alone) but most of mankind know not.

Al a'raaf 187

Jinns do exist and they'll be accounted as well

And on the Day when He will gather them (all) together (and say): "O you assembly of jinn! Many did you mislead of men," and their Auliyâ' (friends and helpers) amongst men will say: "Our Lord! We benefited one from the other, but now we have reached our appointed term which You did appoint for us." He will say: "The Fire be your dwelling¬place, you will dwell therein forever, except as Allâh may will. Certainly your Lord is All¬Wise, All¬Knowing."

And thus We do make the Zâlimûn (polytheists and wrong-doers) Auliyâ' (supporters and helpers) of one another (in committing crimes), because of that which they used to earn.

O you assembly of jinn and mankind! "Did not there come to you Messengers from amongst you, reciting unto you My Verses and warning you of the meeting of this Day of yours?" They will say: "We bear witness against ourselves." It was the life of this world that deceived them. And they will bear witness against themselves that they were disbelievers

Al an'aam 128-130

Jesus will return

No one will remain from among the People of the Book but will certainly believe in him
[Īsā (Jesus), son of Maryam (Mary), as a human] being before he dies,and on the Day of Doom, he shall be a witness against them.

An-Nisa 159