I don't think it is possible to believe in Jesus and then not believe what He said.
The purpose of the Watchtower organization is to take as many people to hell as possible. They do this by tricking people into rejecting the bare minimum requirements for the free gift of Salvation that Jesus offered to ”whosoever”.
One of the stipulations for salvation is belief that Jesus was raised from the dead:
if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. - Romans 10: 9
Jehovah’s Witnesses dutifully repeat the Watchtower opinion that Jesus was not resurrected. They teach his body was “dissolved into gases”. They teach that the person who presented himself as Jesus after the crucifixion was really Michael the Archangel in a body that he somehow fabricated and in-dwelt while he interacted with people before the ascension into heaven.
Jehovah’s Witnesses also reject the new covenant “for the forgiveness of sins” that Jesus offered to “whosoever” in Mt. 26: 27–28
“And he took a cup, and when he had given thanks he gave it to them, saying, “Drink of it, all of you, 28 for this is my blood of the covenant, which is poured out for many for the forgiveness of sins”.
In John 10:18 and John 2: 19, Jesus predicts that He will raise Himself from the dead. Jehovah’s Witnesses do not believe Jesus when he predicted that he would raise himself from the dead, in effect calling the Lord a liar.
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. - John 3: 16
What say you?