I don't really have an answer to your question, maybe someone with more understanding of Guru Granth Saheb can answer your question. But
what is wrong with worshiping that force, power, energy or God that has existed before time as we know it began and will continue to exist after this universe is all gone.
According to Christianity Jesus is also God, Son of God, He sits at the right hand side to the throne of God. God has enlightened many and will continue to enlighten many more. Its only in christianity that God just has to be jesus. The creator talked about in Guru Granth Saheb is not only the creator of us but supports many other fields of creation in Universe.