Finally, an analysis based on facts.
No, It is still conjecture. If they got any people to the ground, all they have to do is hand out rifles. One man, 10 rounds, go into battle. It would still be a loss on their side, but no modern country ever faced 500,000 soldiers each with a rifle on the ground at their borders when their borders are the size of New Jersey. Many would die.
Problem would be getting to fight, that's all.
I'm not the least bit worried about muslim armies. Why would any despot put his throne at risk when terrorism works so well? They get everything they want with it, and it looks like the west is content to lie back and take it.