Why are Christians and Muslims such divided communities?

You obviously have no real knowledge of what you are writing about.

You know a religion by its acts. This is why there is such a divide.

I lived in a very Muslim area of Ottawa, Canada.  My daughter's school was 50% Muslim, and 50% mostly Christian.  There were no issues between the people there at all.  No Christian-Muslim animosity, nor anything like that.  Christians, and Muslims can live together in peace, and in Ottawa, they certainly did.

Christianity has been split into over 39,500 different denominations, sects and cults setting Christian against Christian and Christians against everyone else!

God's work? Hardly!

It must be the Devil and the Antichrist working together to divide, conquer and destroy Christianity from the inside!

DR. GHALI

And the bondmen of The All-Merciful are the ones who walk on the earth gently, and when the ignorant address them, they say, "Peace!"

There is one almighty issue that divides these 2 communities - it is, "Who is Jesus Christ"? If they believed in the same Jesus, there could be no diametric opposition. All over the world, in every group of people, in every faith group, it is the question of who Jesus really is that causes division. I offer no excuses for Christians killing others, in the name of their religion, for Christ condemned that. "If my kingdom was of this world, my followers would have fought, but now my kingdom is from another place." John 18:36. And Jesus commanded Christians to love their enemies and to pray for those persecuting them. You'd be surprised how many do.

Christians don't kill if they follow the NT, Jesus,  so they can't be Christian. 

Muslims CAN and DO.  Christians do not HATE or they are not Christian. 

Muslims CAN and DO hate.

There are many groups of Muslims,  no guide in this.

But Christianity has guidelines that indicate if one is Christian or NOT.

Where does this happen with so called Christians? 

They're losing their salvation. 

Muslims love Christians as long as they don't live near them, Christians hate Muslims no matter where they live.