The Crusades were to try and take back Jerusalem from the Muslims.This has no resemblance to that.

Only about 20% of the invaders are Syrian. They are fleeing ISIS not the Syrian government. Most of the invaders are male and of military age. Very few women and children. There has to be a lot of funding to pay for passage and nice new/clean clothing for these people. This can only be an invasion to destroy the European culture to make them easier to rule by the Elite.

You are going to have to look at the real history of Europe between about 900 and 1450 AD when the original invasion of Europe by the Muslims happened. Vlad the Impaler stopped them in east Europe. The last of the Muslims were driven out of Spain shortly before Columbus sailed. It was a bloody time not told about in your school history books.

When you find where the financing for these invaders in coming from, you will know why it is happening now.