Contradiction with Genesis 1:26
Suggests a plurality in the Godhead when God says, "Let us make man in our image," contrasting with the emphasis on singularity of God in Zechariah 14:9.
Genesis 1:26: And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
Contradiction with Deuteronomy 6:4
While affirming the oneness of God, it has been interpreted by some as allowing for complexity within God, which can be seen as different from the exclusivity suggested in Zechariah 14:9.
Deuteronomy 6:4: Hear, O Israel: The LORD our God [is] one LORD:
Contradiction with Matthew 28:19
Mentions Father, Son, and Holy Ghost, indicating a complexity that may contrast with the singular kingship focus in Zechariah 14:9.
Matthew 28:19: Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: [teach...: or, make disciples, or, Christians of all nations]
Contradiction with John 1:1
Describes the Word as both with God and being God, which introduces a complexity in divinity that seems to contrast with the singular view in Zechariah 14:9.
John 1:1: In the beginning was the Word, and the Word was with God, and the Word was God.
Contradiction with 1 Corinthians 8:6
Acknowledges one God, the Father, but also one Lord, Jesus Christ, implying a distinction that can contrast with the unified kingship in Zechariah 14:9.
1 Corinthians 8:6: But to us [there is but] one God, the Father, of whom [are] all things, and we in him; and one Lord Jesus Christ, by whom [are] all things, and we by him. [in: or, for]
Contradiction with 1 John 5:7
References the Father, the Word, and the Holy Ghost as one, which introduces a complexity that might differ from the singular oneness depicted in Zechariah 14:9.
1 John 5:7: For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.