[Shadowrun]

he said it was on shabbos (i have never gone to the shul in question) but im guessing that means its a lot more then 10 people.

Anyone can lead prayers as long as you know how, you dont have to be a rabbi to do this. This could be taught in a week easy (if you know basic hebrew), there are some variations even from shul to shul that would help knowing.

IF he had to read the parsha (a section of torah read) thats a lot harder because there are no accent marks, though depending on the parsha it may be easier or harder.

Making a speech is a joke and there are always guest speakers.

I dont get how he convinced everyone that he is a Rabbi unless he personally told everyone?