"What difference does it make? How does it hurt anyone to call energy "God"?"

Because, as I have said about 127 times, the language one uses to describe a phenomenon affects your conceptual notions of the metaphysical nature involved. Using culturally 'loaded' terminology causes changes in what is visualized and in the values assigned to the idea.

If one means a personal, Supreme Being who 'cares', then say "God", as that is the standard nomenclature...if one means some abstract principle about the nature of matter, or wishes to posit some vague form of energy called 'spirit', then it needs more than a sweeping declaration that "all is one".