I find your "messenger" to be... less than convincing. In fact? The very existence of self-aggrandizing people such as your "profit" to be high quality proof that gods cannot possibly exist.
What sort of god would stoop so low, as to send someone who is so... unbelievable?
What sort of god even needs to use an intermediary, anyway? That smacks of either laziness, or incompetence or?
Worse-- it plays Special Favorites. Playing Special Favorites is UnJust.
That's not good-- especially if you are wanting to take the moral high ground.
God necessarily MUST use an intermediary. Or take the form of a human. Same difference.
Why, you ask? Well let's have a psychology lesson. What happens when the average person (Moses was a bit odd) sees a burning bush. That's right, he doesn't talk to it. And if it ever talks to him, he believes himself crazy and/or runs away. Now is it any different if it is a dog or cat talking, an angel (still an intermediary but a decidedly not human one), or a giant glowing Triforce? No, regardless of the form, it takes time that God doesn't have to talk to ppl.
So it isn't laziness or lack of power. It's that we as a species tend to be scared of the supernatural. So much so that "don't be afraid" in some form is always said in the Bible when one has an encounter.
As to choosing a person, this is how relationships are built, one on one. If the auditorium approach worked, alot more messages would be given by huge crowds. And intermediary typically has to convince followers personally. If you don't believe me, walk into Times Square on a busy day, and scream "The world will end in 9 days." At worst, you'll be arrested for public disturbance, at best those nine days will pass without anyone heeding your warning. God has to come to us indirectly through humans, and has to talk to us one on one.