**For starters, the Crusades to the East were in every way defensive wars. They were a direct response to Muslim aggression — an attempt to turn back or defend against Muslim conquests of Christian lands.**
Will this happen again?
“Will this happen again?”
When all Christians have their eyes open I would say yes. Right now there is a holy war going on but only one side is fighting and the other for the most part is oblivious to it.
The real question is what is it going to take for Christians (and Jews) to realize they are in a holy war? Will it be to late? It almost was last time.
Not likely, we have political correctness that emasculates the truth and is afraid to offend anyone except those who must live under it.
That is why we will only give lip service to the coming invasion of an ally(israel, see Ezekiel 38-39).