I agree Dear Dr. Saheb, As far as I can see there's no definition of the word Muslim as such in the whole Quran. Even the kalima is not written as such but we can't say all definitions are 'man-made'.Allah defines RIGHTEOUSNESS 2:177 ONLY.
As far as the matter of faith is concerned, my belief or understanding about Angels and Jinns etc can't harm anyone else. Similarly since Quran doesn't specify the method of offering prayer, I hope all rakoos and sajood may be acceptable to him if performed with sincerity of the heart. But our actions have to do a lot with the people, if I'm an unjust person and this thing destroys the whole BALANCE of the family and the society.
Allah says all Prophets were the prophets of ISLAM and were given the SAME RELIGION 42:13 so all the followers were supposed to be MUSLIMS of there time, but since they all deviated from the TRUE religion, they are called Jewish and Christians.
3:65 O People of the Book! Why do you argue about Abraham, when the Torah and the Gospel were not revealed until after him? Do you not use your intelligence?
3:66 You argued (with Moses and Jesus) in matters of which you had knowledge. Why do you dispute in matters that you know nothing about? Indeed, God knows and you know not.
3:67 Abraham was neither a Jew nor a Christian, but he was an upright man who had surrendered to God. He never ascribed divinity to anyone beside the One True God.
3:68People most worthy of Abraham are those who followed him, and this Prophet and those who believe with him. And God is the Protecting Friend of the true believers.QXP
Verse 3:68 tells us the importance of believing in Prophet Muhammad (S) and his Message, clearly.
But the tolerance of Allah is so fascinating when He says;
5:69 Those who attain belief (and call themselves Muslims) and those who are Jews, and the agnostics, and Christians; whoever believes in God and the Last Day, and helps people, for them shall be no fear from without, nor shall grief touch them from within. QXP
Why should we judge anybody?