What about the sinner? Should they worship the Holy Ghost?

Emphatically, Yes! The Holy Ghost is God in the earth today. God is no respecter of persons when it comes to worship.
When anyone reaches out to the Holy Ghost, via the vehicle of worship, He begins to move toward them on their behalf.  see Acts 10
This is the correct footing for everyone to begin on, especially “Society Members.”
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What About Jesus?

What about Jesus? Oftentimes when we talk about the Holy Ghost so much people think we forgot about Jesus, don’t believe in him, or that we don’t consider him important. Nothing could be further from the truth. Jesus’ life and ministry brought us to this logical conclusion of Holy Ghost Worship, the “Holy Ghost Only” faith, and walking with the Holy Ghost as God in the earth today. Nothing pleases him more.