> why western Christianity made no sense to me.
What specifically? You haven't explained what made no sense to you and what finally made sense to you in Eastern Orthodoxy (I would also avoid lumping Protestantism in with Catholicism under the label "Western"). Could it be that you simply did not understand? Here, I would stick to traditional Catholic teaching as the point of reference as the veritable source for orthodox doctrine and tradition, not some Protestant innovation or corruption.
Mind you, the Catholic Church understands God as the Ipsum Esse Subsistens. Thomistic metaphysics uses this term. Thus God is understood as Existence itself, as Being, not a being (you might say that God does not exist, but rather is, or to abuse the terminology, is existence). God is the "to be". This is to be identified with the "I Am" of Exodus 3:14.
> This is a nice comparison video of Tabernacle and Jewish Temple worship, and its continuation in the Orthodox Christian temples.
The Catholic mass is liturgically, etc. the continuation, fulfillment, and perfection of the sacrifices made at the Temple of Jerusalem. The altar is where the perfect, unbloody sacrifice of Christ is offered at each and every mass. This sacrifice is the very purpose of the mass. (Following the destruction of the Temple, the Jews have no priesthood, no temple, and no sacrifices, only synanogues.) So that is no news from a Catholic POV (it may be for poorly catechized and Protestantized Catholics today, but that's a different story).
> The western church in Rome was of the same One Mind of Christ in worship, Creed and sacrament until 1054 and then subsequently the Protestant revolted against their dogmatic innovations, and yet now are splintered into thousands on thousands of beliefs.
I'm not sure you have an entirely accurate view [0].
[0] https://www.catholic.com/encyclopedia/eastern-schism