It's very sad that FALSE CULTS deny the deity of Jesus Christ. The best advice I can give you is to ignore them completely.
Jesus Christ is God the Son, one with God the Father and God the Holy Spirit - yet the three are ONE. Almighty God is a Holy Trinity and has been for eternity past.
John is a beautiful book of the Bible. John introduces you to the absolute deity of Jesus Christ. In other words, Jesus Christ is God. John 1:1-3 refers to Jesus Christ as The Word and Creator.
John 1:1-3 KJV In the beginning was the Word, and the Word was with God, and the Word was God. 2. The same was in the beginning with God. 3. All things were made by him; and without him was not any thing made that was made.
Read all of John Chapter one and it will become obvious that Jesus Christ is being talked about.
John 1:14 KJV And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
In short, Jesus Christ is God (God the Son). Those who tell you differently are liars.