Are you saying that those who don't have "faith in Jesus Christ, his death and resurrection, and that alone" don't make it into heaven? Then that is certainly a requirement, isn't it? If you miss out if you haven't done this, then doing this is a requirement, no?
Is having Jesus as King substantially different from accepting Jesus as Lord? If not, and if you need to have Jesus as King to go to heaven, then you are saying that having Jesus as Lord is a requirement, no?
So I see 2 requirements from you, accept Jesus as King and "faith in Jesus Christ, his death and resurrection, and that alone" whatever that means. Are both required, or can you make it with just one? Are there any more requirements?