It's not really my business, but let's see what we have here...
So the messiah thing seems to be the crux (no pun intended, if you know Latin) of the misunderstanding between the three Semitic religions. One can't get rid of the "messiah thing" because they see him as the son of God.
The other can't recognize the other's messiah because he doesn't fit the prophesies. And another thinks it is their business to state what the messiah is for both the others.
Furthermore, two recognize one holy book (which isn't the same holy book.) One recognizes two holy books, but not the third. All holy books are proclaimed by a number of their followers to be the word of God, but really aren't. (Two holy books have anonymous authors, while another is reportedly from an angel to an illiterate person, who is claimed to have recited it from memory.)
Finally, two say they are right and that the others should convert to their beliefs, while the other says that you don't have to convert, just be righteous and faithful.
So there's only one way I can see to resolve it all:
Follow your faith, leave the others to follow theirs, and mind your own faith's business.
OK, that's three things, but they should be combined into one.