Question for Muslims

[tor]

Fighting is also allowed in the defense of the religion(islam) , don't you see how vague these rules are ? who decides what ?

Wrong.

We can teach people and preach to them the religion, but again, what we cannot do is fight anyone unless they pose a threat to our own lives.

Interesting admonition for a group which stormed out of Arabia and attacked everyone in sight, isn't it? Perhaps they weren't "True Muslims?"

Muslims stormed out of Arabia only to preach the religion, not to attack. And they established peace treaties as well.

Did those pagans pose threat to the muslim lives? if not then they violated then those muslims violated your principle you posted above.