1. The unforgivable sin is witnessing the power of God and calling it from Satan. For instance, the pharisees saw Jesus heal people, and said he got that power from Satan. Read the scripture in context (Mark 3:29-30).
2. God has not given us a spirit of fear but of love, as children of God. Fear is from Satan. Don't fall for it. (Romans 8:12-16)
3. Don't worry about tomorrow or the next day. Live each day with honor and love, and the rest takes care of itself. (Matthew 6:19-34)
The Jehovah's Witnesses say that the rest of the world is under the power of Satan, and deny all the good that is outside their walls. If this is false, they are committing the unforgivable sin. If they attract members or keep members out of fear, they are from Satan. If you fear the judgement to come, you have not found the love and forgiveness from God. How did the Watchtower society manage to keep you from that freedom?
“And if anyone causes one of these little ones who believe in me to sin, it would be better for him to be thrown into the sea with a large millstone tied around his neck." Mark 9:42
By denying millions of people the hope of forgiveness, I think the Watchtower society has tied their own millstone.