Is going to heaven a destiny?
There is no way that we can prove that going to heaven is a destiny. If we say so, that will not be true because the Bible says that God wants all men to come to the knowledge of God and be saved. So God actually wants everyone to be saved. There is no person that God does not want to be saved. Therefore, there are no specially destined set of people for heaven.
Apostle Paul once said something which is very instructive. He said that he is watching so that when he has finished preaching to others, he himself won't be a castaway. That means that someone who might have been destined for heaven initially can become a castaway. We should be careful with our lives. Obedience to the doctrines of Jesus Christ is very vital if we want to make it to heaven. We must understand that going to heaven requires commitment.