It may be theologically debated on rather a Christian should support Israel. However, no matter what side you take, Israel will still be prophetically standing for the Revelation events to occur. Israel should be supported politically because they are the only nation in that region that promotes human rights, religious freedom, and a Democratic system of government where the people have the freedom to vote. Their counterintelligence on terrorist organizations is crucial for national security for America and our allies. Due to our aligned beliefs on religious freedom, human rights, and defense from terrorism, many in the middle east consider Israel and America the same. Both infidels and worthy of destruction.
Theologically it is debated because some believe the Old Testament verses like this one below to be obsolete.
Genesis 12:2-3
New International Version
2 “I will make you into a great nation,
and I will bless you;
I will make your name great,
and you will be a blessing.
3 I will bless those who bless you,
and whoever curses you I will curse;
and all peoples on earth
will be blessed through you.”
This is just my interpretation, but I know for a fact that nowhere else in scripture does it counter this promise. Nowhere is it canceled. The bottom portion of verse 3 was completed in Jesus Christ as all people on the Earth were blessed through Jesus's sacrifice. As for the fulfillment of the Old Testament, this is related to the demands of the Mosaic ceremonial laws, judicial laws, and completion of Old Testament prophecy.
I do not see where the promise of I will bless those who bless you, and whoever curses you I will curse, stops from being true.