Assuming you’re genuinely curious to know and not just echoing empty rhetoric, you may want to read this: https://www.google.com/amp/s/amp.theatlantic.com/amp/article...

The language Islamic radicals use to refer to the Westerns is often “crusaders”. It’s a conflict rooted in religion, not practicalities or modern time hostilities.

But I suggest you read the article, it’d be better for explaining the reality than a thousand argumentative HN posts.