Romans 10: 9 - If you declare with your mouth, “Jesus is Lord,” and believe in your heart that God raised him from the dead, you will be saved.
Pretty simple. So, what does WT do? They say Jehovah is Lord instead of Jesus, and they claim Jesus was not resurrected but his body was turned into gases.
Jesus resurrected - Jesus returned to life; no longer dead
Just about every JW I know has literally declared this with their literal mouth.
Jesus didn't get technical about the word resurrected. Back in the flesh, gases, etc. The point is he was non living, and returned to life. All JWs believe this.
There are no scriptures that indicate a person's sincerity is in any way connected to salvation from judgment. That is little more than self idolatry.
How would you explain how Jesus forgave the criminal hanging next to him on the cross?