You need to read your own posts before you put them up because a lot of what you try to say is unclear or make no sense.
Nothing in Norse and many other Pagan religions say that you need to go out there and convert other people to your religion and if they do not you can go lie cheat steal kill or whatever you want with them. The reverse cannot be said of the Abrahamic religions.
The crusades happened because the pope called them in the name of God. Any number of people who went on crusades went because they considered themselves pious and thought they were fighting for a holy cause. I don't know how you can argue that it isn't religious.
And a lot of what you say is based on popular versions of history that don't bear up under the actual evidence.
It's somewhat difficult to know what Norse "religion" said about other religions, the only remotely impartial accounts come from the Roman period when Roman ethnographers (like Tacitus) described the Germans and their religion. What we do know is that the majority of the Germanic Pagans killed at least some missionaries, this was so widespread that I understand the English would boast of having been peacefully converted.
There's actually nothing in Judaism or Islam that says you need to convert other people to your religion, it just says that if they don't convert they're outside your community, which is common to pretty much all religious systems (even modern ones). We have secular communities now but in the medieval period most communities were based around a particular religion, everything was bound up in it.
Christianity, obviously, does have a converting impetus but even in that case it doesn't allow you to "go lie cheat steal kill or whatever you want with them".
The Crusades happened because Alexios I wrote a letter to Pope Innocent asking for help against the heathens, and he got a lot more help than he wanted. Subsequent Crusades were aimed at either defending or reclaiming Outremer. By the time the Second Crusade kicked off several generations had elapsed and the "Franks" were quite rooted in the Holy Land, the whole sage is primarily a political and cultural one. Yes, there was a religious element but there was a religious element in everything at that time, it was just how the world was.
I'm no expert on religion, but shouldnt Abrahamic faiths be considered monotheistic not atheistic? I mean it as as an honest question.
You're right. That dude has no idea what's he is talking about. A religion cannot be Atheistic, and Christianity is most definitely Monotheistic.
Actually, a religion can be "atheistic" if it rejects the belief in the existence of other Gods. Monotheism is, strictly, the worship of only one God. So Mithraism and Zoroastrianism are Monotheistic whilst Judaism, Christianity and Islam are Atheistic. If you worship Mithras you can't also worship Zeus or Odin, but that doesn't mean they don't exist - Christians etc. believe Zeus doesn't exist and that is the Classical definition of "atheism". It's why the Romans found Jews and Christians so offensive but many of their soldiers were free to openly worship Mithras.
In the modern world we have this extreme form of absolute atheism so people now find it odd to have the term applied to Judaism etc.