I dont know

[Breathe]

Islam is a religion best suited to the nature of mankind,

Why? Do you have any proof?

but instead provides a middle path;

But Buddhism is the Middle Path, and is over a thousand years older than Islam.

I think we dont know Islam very well because Islam is frequently misunderstood and may even seem exotic in some parts of today's world.

For some, yes, but not always.

Religion by definition means commitment and an obligation to a master.

How do you come to that conclusion, and are you speaking etymologically or by implication? The English word for religion does not mean commitment and an obligation to a master (re-ligo; "I unite again" or "I reconnect".

If you are going by implication, it's still not correct. Not all religions have commitment surrender to a master as ideas in their faith.

but is the universal and eternal deen known through Prophets to every nation of people since the human race first began.

Is there any evidence of that?