Israel is not a state with Christian morale, they are not a part of the "Western world". They have their own religion and morale, which are older than Christianity. Only part of holy books are shared between two.
From a Western perspective, there's no denying at least some Christian influence. We inherit a morality and philosophical tradition and that was shaped by a Christian-dominated culture for a large chunk of its history.
Highly recommend (not Spider-Man) Tom Holland's book Dominion for more on how that all played out.
Religion shapes morale. Morale shapes religion. They are not equal, but they influence each other.
Moreover, human actions is heavily influenced by circumstances. With low birth rate, it's better to protect children. With high birth rate, it's OK to sacrifice some young man to free some space, like farmers do for their crops, thus we see different messages in different circumstances even in countries with same religion and morale.
Moreover, humans are good at placing arbitrary boundaries, for example Catholics are OK to kill other nations en masse because "they are not Catholics, so they have no soul, so they are not humans, they are like pigs". Some versions of Islam even encourages holy war against non-Muslims. Some other minor religions are even promoting cannibalism. Even atheists are promoting mass killings, for example communists want to kill all rich(-ier than them).
So, while Christianity promotes peace, latest 2 world wars and current greatest war since WWII, are between Christians. Guess who will use nuclear weapon for second time in the history? North Korea? Iran? China? USA? Britain? Russia? Ukraine?
