Per the Nicene Creed:
"We believe in one Lord, Jesus Christ..."
“My Lord and my God!” Thomas exclaimed.
They replied, “Believe in the Lord Jesus and you will be saved, along with everyone in your household.”
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Truth is...there are SEVERAL more Scriptures calling Jesus Lord that could be quoted, but the point is this: there is only one Lord, and a person can't have divided loyalties. As Jesus himself said, "No one can serve two masters. For you will hate one and love the other; you will be devoted to one and despise the other." (Matthew 6:24 and Luke 16:13) And as Bob Dylan said, "You gotta serve somebody. It may be the devil or it may be the lord, but you still gotta serve somebody."
Bonus Truth: Serving the one lord is what makes a church body a church body. Please watch and enjoy this music video ("One Lord One Body") from the church body I call home.