There is no moral justification for Israel's right to exist. Israel does not have a right to exist. They exist purely as a foreign invasion force originally started by European Jews - who didn't even practice or believe in Judaism - in order to make their own private racist mediterranean resort state by killing the native people and stealing their land.

What makes you think anyone would want support their existence over the rights of the existing Palestinian people that lived there and are currently fighting to reclaim their homes?

Religions do not have a right of inheritance. A person can't claim your home when you die because they also happen to be Christian. The only legal inheritance are those with title. And no one from Europe that decided to attack and invade Palestine can show any deed or title to the land they claimed to "own" 2000 years ago when they decided to move to Europe.

So, no. The state of Israel exists purely as a criminal enterprise of murder and theft. Let's not encourage its continued existence.