We have the technology to make a hologram of God, or to perform a fake miracle of some kind.
Make a fake miracle happen in Israel/Gaza where lots of Israelis and Palestinians can see it.
Get a bunch of Palestinians and Israelis to convert to a new peaceful religion where the only way to go to heaven is to treat everyone like you would treat your family, with love and respect. It would have to be a straightforward religion without all the mumbo jumbo left up for interpretation.