The arguments presented to reject the Trinity are the same arguments used for 300 years which fail to address all Scriptural use of the persons of God. It is why it took some 300 years to establish the doctrine of the Trinity as orthodox faith throughout the Church. It’s one of the reasons the JWs are a cult.
I am not a Jehovah Witness and don’t generally hold them in high regard.
However, on that particular point that Jesus is not God, they are correct.
Calling someone a “Cult” because they don’t agree with you is an Ad hominem attack.
Trinitarians can’t really sucessully argue the Trinitarian point of view as it doesn’t hold up to scrutiny by honest seeking persons.
God identified Jesus as his Son. Peter identified Jesus as the Son of God. Peter said he was a Man. Jesus himself said things which indicate He was not the Father (i.e. Jesus said he didn’t know when the world would end, only the Father knew).
The list goes on and on.
Only a few scriptures can really be pointed to support the idea, and there is controversy surrounding the translation of most them (John 1:1)
To the sincere seeking person, ask God to show you the Truth. It is an important issue and,sadly, most so-called Christians have it wrong.