@Alexandergreat3,
While we can ask whatever questions may come to our minds, in order to throw imaginative ideas around some (which can be fun, of course), it will surely contain much, much less meaning if we were to fail to apply good thought and logic.
We have this somewhat clear image, in English, of a character named Jesus, based on some writings from the mid first century to the early second, and commentaries from the Apostolic Fathers, and Church Fathers, and some other fragments of lost texts. However, these are mostly in Greek, in which that figure is
Iesu, which, in turn, is the Greek transliteration of the Hebrew name
Yeshua.
Yeshua would have, with very, very little room for doubt, been Jewish--
a follower of the Mosaic Law (in some way or another).
It is not clear at all that the actual, historical character was just of that character...personality...nor that the historical man acted, and did, as is ascribed to that character in those works. Much less, can we determine that any Hebrew male (a charismatic leader of a cult-like movement [and there were a possible number of such before the first century, and before the Roman sack of Jerusalem]) would have been able to do some of the unnatural miraculous things also ascribed to that character. So, even more so, can we suddenly jump to any conclusion that any historical
Yeshua could have been deity, or YHWH? The far most likely answer is
no.
It is a historical error to not take into careful consideration the setting, circumstances, and religious belief-system, in which and by which the cult which one Yeshua, along with a few of his relatives had formulated, had been a part of--
and that major connect.
Of course here, the OP question is logically incorrect--impossible. We can think, however, that a possible intention might have been to ask,'
if Jesus were to have come back again in the 20th century, what difference would that have made in Christianity?'