Must Christians support Israels actions in Gaza?

Must Christians support Israels actions in Gaza even when they take God as an excuse to murder Children and woman?

By any means no.

Not just because they reject Jesus but its important to know what that implies.

The Jews rejected Jesus because He failed, in their eyes, to do what they expected their Messiah to do:

Destroy evil and all their enemies and establish an eternal kingdom with Israel as the preeminent nation in the world. (this is there goal)

The prophecies in Isaiah 53 and Psalm 22 describe a suffering Messiah who would be persecuted and killed, but the Jews chose to focus instead on those prophecies that discuss His glorious victories, not His crucifixion.

The commentaries in the Talmud, written before the onset of Christianity, clearly discuss the Messianic prophecies of Isaiah 53 and Psalm 22 and puzzle over how these would be fulfilled with the glorious setting up of the kingdom of the Messiah. After the church used these prophecies to prove the claims of Christ, the Jews took the position that the prophecies did not refer to the Messiah, but to Israel.

They reject all others who don't think like them including Christians and Muslims.

Christians should NOT to support Israel NOR to condemn it; nor any other people. But our moral imperative as people of faith permit us to judge them for there wrong doings and sins.

As Christians when it comes to the atrocities been committed by Israel in Gaza we can condemn and should.