Question #1
Why the Trinity? Why Jesus and the Holy Ghost; why not just God? Are there some things God the father is not capable of which requires the assistance of the Holy Ghost, or Jesus?
I think this question is a lot better than the many threads we've seen on this topic lately. I won't say that this representation is purely for our sake, to be able to relate better; but I will say that perspective is a key element of "our reality." So it's maybe not so hard to fathom G-d in a far away, unreachable state. What about Him , in our midst? Operating within us, communing with us, implanting thoughts and desires? So we have this "Person of the Holy Ghost." Still every bit G-d, but maybe we can relate better.
Then Jesus. Yeah, that sorta puts a snafu on
everything, doesn't it? I mean, who really wants to be held accountable for everything we do, think, say, or even just want? And yet we can't think of G-d the Father as being this human Person, because Jesus' human existence in no way minimized any aspect of G-d.
So 3 different ways of knowing Him. Make any sense to you?
Question #2
Did those who were closest to Jesus; Mary, his parents, his disciples, etc. pray to him and worship him as God? Or did they simply follow and learn from him as a leader.
Ken
Nobody really understood what was going on til after the day of Pentecost, 50 days after the crucifixion. How did Mary go from seeing Angels announce His birth, to acting like a normal Mom? Well, she gave birth, and raised a child.

That can change things! I'm sure there were LOTS of times Jesus wasn't a leader to anyone. Picture growing up in a poor carpenter's family, in a land where you can't even grow a tree and it never rains! How did His Dad react the first time he scrapped a piece of wood (due to a mistake) that had been worked on quite a bit already? How old was Jesus when He raised His first blister? Pretty young, I bet.