Re: Bowing to Kamidana/Kamiza
I bow..(showing respect) but refrain from clapping (summoning kami/spirits) as that seems, and is stated to be part of Shinto religious ritual.
I respect the founder, I don't worship him.( or multiple kami )
I respect you (Bow) I don't worship you either.
Bowing has been given over-importance here in the west since we are so ignorant of the "proper" actions and wish to fit in the larger world of practitioners.
Simple respect, courtesy. Seems sufficient reason to me.
We shake hands in the west as a holdover from the time when a clasped hand was an un-armed hand. To show trust/respect.
That iswhy it is the right hand to shake with, since 90% are right handed.