Certainly his current antics on
List of Russian Jews, where he is threatening to wreck the list in retaliation for some dimwit repeatedly trying to add Lenin, don't smack of maturity. He even deleted Zinoviev, noting that there was somebody on the list whose father but not mother was Jewish, and every time he found such a name he would delete it and the name of an undoubted Jew.
Also, he is generally regarded as an orthodox Jew, but doesn't seem to realise that Jewish editors are slightly busy at present with the run-up to Passover so don't have time to join in his games. How would any adult Jew not appreciate that?