Islam is from God. And Non-Islam is from the Devil.
The Devil — Shaitan — and his ilk fight Islam.
They are the followers of falsehood and worshipers of the Devil.
They are the breakers of the Biblical Commandments.
Their life is a celebration of the Seven Deadly Sins that the Bible talks about.
They worship all kinds of gods besides God, which is a direct violation of the First Commandment in the Bible.
Their methodology is one of falsehood: It is a methodology of Lies and Deceit.
Whereas the methodology of Islam is Truth: Haq and Sidq.
The objective of Islam is Adl — justice and fairness and equity for all people all over the world.
The objective of non-Islam is Zulm and Udwaan: oppression; aggression; and exploitation of others and inflicting of harm on them.
In a confused and confusing world, you can tell which is which, and who is who, by trying to find out who is telling the truth and who is not. And who is standing up for justice and fairness for all and who is not.
It is that simple.