Actually this is quite a good question. The Bible itself tells the reader that those who wear their hearts for jesus on the outside are not worthy of him. So yes I think that would be the last thing he would like to see, supposing he actually exists.
He would perhaps accept it however he would look down on how they are treating the Wicca religious groups. He would want them to accept all religions as they are rather then being uptight and Intolerant.
Abu Huraira reported that the Messenger of Allah (may peace be upon him) said: By Him in Whose hand is my life, the son of Mary (may peace be upon him) will soon descend among you as a just judge. He will break crosses, kill swine and abolish Jizya and the wealth will pour forth to such an extent that no one will accept it.
Constantine, set the cross as the symbol for Christianity and based it on the Sword of Mithras. It was another way to gain believers, just as was Christmas, and such. All the monks of Mithras wore a sword on their gowns that looked just like the current cross seen in christanity today.