Famous American Jew on the Holy Holocaust. If you deny it you will go to Hell

https://www.creators.com/read/dennis-prager/12/22/if-holocaust-deniers-dont-go-to-hell-there-is-no-god

As for Messias-Deniers?  

Luke 19:[27] But as for those my enemies, who would not have me reign over them, bring them hither, and kill them before me.

Ver. 27.—But those mine enemies (the Jews, His citizens, who would not have Him to reign over them) bring them hither—to my Tribunal, in the valley of Jehosaphat and Jerusalem—and kill them before Me.” In the Greek, “Kill them before my face.” Our Lord alludes to those victorious kings who slew and destroyed their conquered rebels. By this destruction Christ signifies the extreme judgment of the Jews and His other enemies, and their own condemnation to eternal death in Gehenna, and that a living and vital death, where they will be perpetually tormented by death-dealing flames, and yet will never die. Our Lord alludes to Titus, who slaughtered the conquered Jews. He describes precisely to the letter the condemnation of the Jews, and the Gehenna which He has appointed for them when He shall return from heaven to judge and condemn them and the reprobate.