How can you justify the trinity, when God is one? And how can you call Jesus Lord, when the Old Testament says there is no other Lord but God?
Scripture clearly teaches there are three distinct Persons in the Deity – Father, Son, and Spirit – yet absolutely one in nature, mind, purpose, and way; together forming the one, true, eternal God. In the New Testament we have the full revelation of this truth (Matt.28:19) , but it is established in the Old Testament; indeed, in the first verse of Genesis the Hebrew name translated God is Elohim, the plural form of Eloah. It suggests a trinity in the Being who created all things. In v. 2 the Spirit is named. Ps. 2 plainly declares the Son and hence if One is Son the other must be Father (Pro.30:4). In the New Testament the Trinity is seen throughout. Christ was here, declaring Himself the Son, speaking to His Father, the Spirit coming upon Him in the form of a dove.
We call Jesus Lord, for such He is. "God hath made the same Jesus, whom ye have crucified, both Lord and Christ" (Acts 2). He is My Lord (Jn. 20:13, 28). He is Our Lord Jesus Christ (1 Cor. 1:2, 3). And "no man can say that Jesus is the Lord, but by the Holy Ghost" (1 Cor. 12:3).
J. A. Pickering