I think the way in which Hitler resonated with Christians (and not really qualified as one) was his stance on the patriarchy, strong family values, and being an anti-feminist as taught in the bible. He was against homosexuality and a lot of the "filth" that Christians also find objectionable.
A lot of folks have associated Hitler with the antichrist and it's ironic because the ones he persecuted are anti-christ by definition. If you don't believe me, try wishing a jewish person merry christmas and be prepared to defend yourself. "Happy Holidays" is no viable substitution either.
1 Thessalonians 2:14-16
14 For ye, brethren, became followers of the churches of God which in Judaea are in Christ Jesus: for ye also have suffered like things of your own countrymen, even as they have of the Jews:
15 Who both killed the Lord Jesus, and their own prophets, and have persecuted us; and they please not God, and are contrary to all men:
16 Forbidding us to speak to the Gentiles that they might be saved, to fill up their sins alway: for the wrath is come upon them to the uttermost.
John 8:37-44
37 I know that ye are Abraham's seed; but ye seek to kill me, because my word hath no place in you.
38 I speak that which I have seen with my Father: and ye do that which ye have seen with your father.
39 They answered and said unto him, Abraham is our father. Jesus saith unto them, If ye were Abraham's children, ye would do the works of Abraham.
40 But now ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham.
41 Ye do the deeds of your father. Then said they to him, We be not born of fornication; we have one Father, even God.
42 Jesus said unto them, If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but he sent me.
43 Why do ye not understand my speech? even because ye cannot hear my word.
44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
Did Jesus pull a "Hitler" and ad hominem an entire group of people? A blanket condemnation? Does that answer the question of where God was on that day of beautiful Polish sky? Do we condemn God for allowing such atrocity to a people he, apparently, already condemned for killing his only Son?
John 19:6-16
6 When the chief priests therefore and officers saw him, they cried out, saying, Crucify him, crucify him. Pilate saith unto them, Take ye him, and crucify him: for I find no fault in him.
7 The Jews answered him, We have a law, and by our law he ought to die, because he made himself the Son of God.
8 When Pilate therefore heard that saying, he was the more afraid;
9 And went again into the judgment hall, and saith unto Jesus, Whence art thou? But Jesus gave him no answer.
10 Then saith Pilate unto him, Speakest thou not unto me? knowest thou not that I have power to crucify thee, and have power to release thee?
11 Jesus answered, Thou couldest have no power at all against me, except it were given thee from above: therefore he that delivered me unto thee hath the greater sin.
12 And from thenceforth Pilate sought to release him: but the Jews cried out, saying, If thou let this man go, thou art not Caesar's friend: whosoever maketh himself a king speaketh against Caesar.
13 When Pilate therefore heard that saying, he brought Jesus forth, and sat down in the judgment seat in a place that is called the Pavement, but in the Hebrew, Gabbatha.
14 And it was the preparation of the passover, and about the sixth hour: and he saith unto the Jews, Behold your King!
15 But they cried out, Away with him, away with him, crucify him. Pilate saith unto them, Shall I crucify your King? The chief priests answered, We have no king but Caesar.
16 Then delivered he him therefore unto them to be crucified. And they took Jesus, and led him away.
So who is anti-christ?
The Jews believed they could not kill Jesus by their own hand. They had to get the Romans to do it because they believed the blood would not be on their hands. It seems that may have been an erroneous assumption.
So, I would say to the jewish survivor, "Did you cry out for Jesus to save you? For it is written that whosoever shall call upon the name of the Lord shall be saved." After which I would call upon Jesus to save me from the flogging that would invariably follow.