Step 1 - Become Jewish In 5 Easy Days!
Members of "Christians United For Israel" (CUFI) lobby for, among other things, a US or Israeli nuclear attack on Iran they hope will provoke catastrophic war and trigger the "Rapture" of Christians but also kill most Israeli Jews or even most Jews on Earth.
CUFI founder pastor John Hagee is a Christian Apocalyptic Dispensationalist who holds a version of "Replacement theology" ; lots of fancy words, but don't worry. The "Christian Apocalyptic....." bit refers to Christians awaiting (and working for) the Apocalypse, Rapture, Armageddon, and so on. OK, got that ? Next: "Replacement theology", also known as "Supercessionism" has two branches.
One holds that Jews are no longer God's chosen people and that Christians are the true inheritors of the Judaic tradition or even the "real" Jews. Virulently anti-Semitic movements such as Christian identity believe that Anglo-Saxons, or Northern Europeans, are the "real" Jews.
The other version holds that Jews are still 'chosen' but to get into Heaven they nonetheless need to accept Jesus as their personal messiah, lord, and savior. John Hagee holds this second type of belief and tries to soften it via the stance that God has given Israel to Jews for perpetuity, so they're special. Sort of. Perpetual, divinely granted land rights don't actually get them into Heaven. They still need Jesus for that and, per Hagee's end-time beliefs, Jews who don't opt to convert to Christianity will die a horrible death and proceed on to an eternity of torment in Hell. Meanwhile, the structure of Hagee's Cornerstone Church congregation seems to suggest an underlying belief that Christians can be Jews (or "Israelites") too, but better actually because "Christian Jews" can get into Heaven. The 20,000 member San Antonio based "Cornerstone Church" is organized around 12 membership "tribes" named after the original 12 Tribes of Israel and this raises the question : if John Hagee expects that the catastrophic war he hopes for will kill most Israeli Jews, then don't his pseudo-Jewish "tribes" at Cornerstone amount to, in effect, "replacement Jews" anyway?