How Do We Know Christianity Is The Right Religion?

In this episode Dr. Betters answers the question, "hi, Dr. betters, my Muslim friend was taught to believe, since he was a child that he could get to heaven by the Muslim method, my SDA friend was taught that he must keep the Sabbath, my JW friend was taught that it will be upon the earth and he must sell watchtower magazine, my catholic neighbor was taught that he had to be a catholic. I was thought that at the point of death, I must have no sin in my life. including my tithes must be paid up! and everyone is fully convinced that their way is the only way. how do I know that yours is any better than someone else?"