what do skeptics think really happened with the apostles of Jesus?

the consensus of historicans is that jesus existed. his apostles are recorded to have spread the faith and to have died for their faith. historicans have record of when jesus’ brother was martyred, the local communities were aghast. st paul one of the leading writers of the bible, is a historical fact that he existed and spread the faith, and to have then died for it. he said he had a vision of jesus at his conversion. 

so what do skeptics think happened? if you dont think jesus existed, why do you deny scholar consensus? why do you think the apostles died for their faith? i know it doesn’t prove the things they said were true, but why do you think they died for it? do you think st paul was a schizophrenic who happened to otherwise be sane, and to become of the leading figures of christainity? were the apostles and st paul deluded, was it a conspiracy of group delusion? why would they lie if they weren’t deluded? does trying to rationalize and minimize the historical nature of all this stuff seem prudent, when there’s the possibility that they weren’t just deluded?