Question
I have a version of the Bracha for Sefirot HaOmer. It has Hay Yud in place of Adonai. It has E-LoKEInu in place of EloHEInu. Because of these replacements, the paper does not have to be buried since it does not contain the name of G-d. Could you explain these two replacement words and why neither is the name of G-d? How does one pronounce Hay Yud? Are these replacement words only for writing purposes? Am I correct that I would still say Adonai and Eloheinu during my recitation? Thanks.

Question
How could a building like the Mishkan or the Beit HaMikdash, or a natural phenomenon like a cloud (at Har Sinai) contain the Presence of the Almighty (Ubiquitous, the infinite volume; omnipotent; omnipresent; omniscient etc. G-d)? 1 Kings 8:12-13; Schneerson: “With the commandment to erect a Sanctuary, G-d gave the promise ‘I will dwell within’. That promise was fulfilled with the manifestation of G-d's Presence in the Sanctuary. The Divine Presence within our material world. [I.e. His immanent presence, rather than יהוה Himself see 1 Kings 8:27].

Question
Idolatry is the most condemned act in the Torah. What makes idolatry a more serious offense than murder? What makes it so believing an inanimate object has spiritual powers is a worse sin than irreversibly ending another person’s life? Obviously one can reverse the damage of praying to a piece of metal or stone made into a certain shape. But no one can ever undo taking away another’s life.