My own opinion is that he would have behaved in exactly the way he did; but since I have no experience of immortality here and now, that opinion is little more than instinct.
I do not feel it is for me to comment on the chances of his being right, or of his being wrong. It is sufficient that the myth he left behind recorded him leading such an unusual life, that his disciples a generation after his death turned him into a God, and gave him equal status with the Creator. Whether they were right to do so, again is hardly for me to say; but the miracles described, in the Fourth Gospel in particular, leave no doubt that the Gospel writers were claiming unambiguously that he was the Messiah.
My view is that if indeed he was the Messiah, then we should be able in appropriate circumstances to reproduce all the miracles he performed. But maybe the circumstances today are not appropriate. Otherwise I cannot see that he saved us from very much. After all, he is supposed to have said that anything we asked he would do for us, anything at all, provided only we asked in his name. Again I view this exhortation rather as an encouragement to attempt as much as we dare, rather than a promise to be taken as the literal truth. But the Church has taken a different view throughout the ages; it assumes that none of us can remotely imitate his life, and preaches that it does not matter very much, because Christ on the cross paid the price of our inadequacy. I leave it to the reader to decide which view Jesus himself would probably have preferred? But then if Jesus had reappeared on earth in the Middle Ages without supernatural power, he would have been burned for heresy; at least that is the opinion of Dean Inge, the gloomy Dean. A gloomy opinion, but realistic?
However, there is not the remotest chance of our imitating Jesus and reproducing his miracles in the immediate future; even if it were possible to do so eventually, a long period of apprenticeship would be needed first. So in the meantime the secular State must be kept going; and that means the relentless prosecution, and adequate punishment, of criminal acts within the State, in order to maintain the Rule of Law; and it means an Army to defend the State from its external enemies, so as to enable the State to continue its existence. The Second Coming of Christ may be fairly soon, or it may be deferred for rather a long time, or as Jews prefer to say the true Messiah may make his appearance sooner, or later; but until this happens, the State and secular society must be kept going. It is unlikely that this apocalyptic event, however one describes it, will be facilitated by allowing society to degenerate into chaos in the meantime. And this means that religion must reconcile itself to the demands of the secular State, at least for the time being, however disagreeable this may be to the clerical establishment. And however much religion deplores the secular State, if it refuses to help the State to continue, it is like someone sawing off the branch on which they are sitting; and then wondering why Western Christendom descended into the Dark Ages when the branch was finally sawn through?