I don’t think you can “counter” this.
Check the history books, but it seems to be fact that Hitler was baptized and raised in the Catholic religion. I think he was even an altar server. He attended a Benedictine monastery school for one year. His mother was a practicing Catholic. He was confirmed and he sang in the choir at the monastery.
In his book Mein Kampf and in his speeches, he spoke of being Christian.
He said in one speech:
I]
“My feeling as a Christian points me to my Lord and Savior as a fighter. It points me to the man who once in loneliness, surrounded only by a few followers, recognized these Jews for what they were and summoned men to fight against them and who, God’s truth! was greatest not as a sufferer but as a fighter. In boundless love as a Christian and as a man I read through the passage which tells us how the Lord at last rose in His might and seized the scourge to drive out of the Temple the brood of vipers and adders. How terrific was his fight against the Jewish poison. Today, after two thousand years, with deepest emotion I recognize more profoundly than ever before the fact that it was for this that He had to shed his blood upon the Cross. As a Christian, I have no duty to allow myself to be cheated, but I have the duty to be a fighter for truth and justice.”