Yes he does.
Prophet Muhammad Born After Christ / Isa. So he didn't exist in 620bc
There are very little about when Muhammadan exited. It has been told that Muhammadan did start centuries ago.
Probably, Yes.While there is some controversy about whether Muhammad existed, the general historical consensus is that he did. Whether he actually communicated with the Angel Gabriel or received God's words is a question of belief.
In a person's imagination, anything may exist.
To perceive means to notice that a thing or person exist; or perhaps, simply, to see.
no, not a person in the universe
No. Quran and Prophet Muhammad have strictly prohibited this thing. Black Magic and Witch Craft do exist but the Prophet Muhammad has asked his followers not to be involved in such things. It is one the greatest sins. No, but you could become a pagan secretly to do it.
I doubt it. How does a person contact this agency IF it does exist?
no the person that wrote it was bored
Normally an Athiest.
The only person that should answer that is yourself.
There is no such person: she or he does not seem to exist.