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It says in the Bible to worship God. If the Holy Spirit is God, I would think the logic train's next stop would be "Hey, we can worship the Holy Spirit too." If you worship God, you are worshiping the Father, Son, and Holy Spirit. They are one. They are inseperable (though distinct). A Christian can not worship one and not the other. God is a Trinity, and it is fitting to worship God in his entirety: Father, Son, and Holy Spirit. If a Christian does not worship the Holy Spirit, then that person is failing to give the honor due to God in his entirety.