To be more accurate, you have base beliefs which are concrete (such as Jehovah being the only true God and Jesus being the Messiah), but there are beliefs you currently have that are subject to change depending on "New Light" by the JW organisation or depending on your own further understanding of the bible.
One must have the courage of their convictions.....if anyone is doubting, and defects, they will sever their own ties with Jehovah who, as "a God of order", has only ever had one "people" who are dedicated to "doing the will of the Father". (Matthew 7:21-23) If one of Jesus' own apostles can defect, and reject the truth, so can anyone else.
2 Chronicles 15:2, to his ancient people and their King God said...
"....Jehovah is with you as long as you prove to be with him; and if you search for him, he will let himself be found by you, but if you leave him he will leave you."
He 'abandoned' the unfaithful Jews after he had fulfilled his covenant with Abraham to produce the promised seed through his descendants. The old covenant was replaced with the foretold "new covenant" that Jesus made with his apostles, who were all Jewish, keeping his promise to produce their Messiah. Those taken into that new covenant were now Jehovah's "people". But "weeds" were to be sown among the "wheat" so a fake form of Christianity was to infiltrate the same field (the world) and satan was identified as the "sower". (Matthew 13:24-30; 36-42)
As part of his prophesy on the last days, Jesus was to appoint a "faithful and discreet slave" to "feed" his entire household their "food at the proper time". (Matthew 24:45) By placing 'his' identity behind a question, he indicated that it might be difficult to spot 'him' because of the prevalence of the "weeds"....but find him we must, and we need to accept the food that he is serving to his fellow slaves. We cannot find him on our own however.....Jehovah is the one who invites those in whom he sees potential to qualify for citizenship in his incoming Kingdom. (John 6:44; 65) No one can come to the son without an invitation from the Father. Invitations can be withdrawn if the person fails to maintain their faith to their death.
"New light " (Proverbs 4:18) is actually "brighter light" that is constantly revealing more details as the end of this system of things draws ever closer. Doctrinally, nothing really changes, but our understanding of things pertaining to the Kingdom is clarified and enhanced....Jesus told us to expect persecution and hatred as our separation from the "weeds" is now complete. Just as the Jews were the strongest enemies of Christianity at the conclusion of the Jewish system, so those in Christendom would be the strongest enemies of Christ's wheat-like disciples at the end of this system of things. (John 15:18-21) If we are not hated and persecuted, then we aren't true Christians.
The door of opportunity will soon be closed, and those who find themselves outside of the "ark" will not fare well. Those who jump ship, either get tired and drown or they get eaten by the sharks. Same result. (Matthew 24:37-39; 1 Peter 3:18-21; 2 Peter 2:20-22)
It is we who must meet God's requirements, not the other way around.....and we are no more perfect that Christ's original apostles....