Were the Israelite not commanded by god to invade the holy land?
Yes around 1400BCE give or take a few.
Were the crusades commanded by their 'Christianity'?
No. That was the Pope at the time.
Yes, the Israelites were commanded by god to invade the holy land and, give or take a century or two, depending on what one chooses to believe, 1400BC is close enough...
Indeed, the crusades were commanded by the pope, for 'Christianity', in response to the Muslim conquests. The crusades 1 through 9, lasted less than 200 years... With great expense and much loss of life for little return and longevity!
Past conquerors include the Egyptians, Hittites, Assyrians, Babylonians, Persians, Greeks, Romans, Arabs, Crusaders, and the Turks. Jews living in Palestine asserted their independence from the British in 1948 and founded the modern state of Israel. Thus making the Jewish 'conquests' a very modern idea.
Conquests have been, at best, transient.
I do believe that Israel SHOULD exist, not for religious reasons, but it is there NOW! Do I believe it should be there now? Well, that is open to debate... Do I believe that it is the BEST location for a homeland for Jews? Absolutely not! Why? Because there will never be peace... Neither side really wants peace, both sides receive 'support' from countries that have little interest other than making money!