Believers have been saved by calling on the Lord Jesus Christ for quite some time before Jehovah's Witnesses had shown up FYI.
Plus; Jesus is the God men had seen in the Old Testament as that Jehovah while at the same time Jesus said He has seen the Father..
John 5:37 And the Father himself, which hath sent me, hath borne witness of me. Ye have neither heard his voice at any time, nor seen his shape. 38 And ye have not his word abiding in you: for whom he hath sent, him ye believe not. 39 Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me. 40 And ye will not come to me, that ye might have life. 41 I receive not honour from men. 42 But I know you, that ye have not the love of God in you. 43 I am come in my Father's name, and ye receive me not: if another shall come in his own name, him ye will receive. 44 How can ye believe, which receive honour one of another, and seek not the honour that cometh from God only? 45 Do not think that I will accuse you to the Father: there is one that accuseth you, even Moses, in whom ye trust. 46 For had ye believed Moses, ye would have believed me; for he wrote of me. 47 But if ye believe not his writings, how shall ye believe my words?
John 6:46 Not that any man hath seen the Father, save he which is of God, he hath seen the Father.
Jesus said He had met Abraham before His incarnation.
John 8:56 Your father Abraham rejoiced to see my day: and he saw it, and was glad. 57 Then said the Jews unto him, Thou art not yet fifty years old, and hast thou seen Abraham? 58 Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am. 59 Then took they up stones to cast at him: but Jesus hid himself, and went out of the temple, going through the midst of them, and so passed by.
Jesus is the Lord Jehovah that had met Isaac & Jacob & even Moses for why He said Moses had written of Him.
Exodus 6:3And I appeared unto Abraham, unto Isaac, and unto Jacob, by the name of God Almighty, but by my name Jehovah was I not known to them.
Something to think about & pray about. Ask the Father to reveal His Son to you that Jesus is Lord to the glory of God the Father.