I don't understand people who never got married or had kids. What will become of them in your old age?
So you believe that life is not complete without kids or marriage?
Yes, marriage and having kids is a must and those who do not do that are not worthy of life.
Those are pretty strong words. It is insensitive to claim that people who are not married or have no kids are not worth anything. Some people choose not to have kids or get married out of preference, and that is their decision. Making this decision is much better than being an unfit parent or enduring in a bad marriage.
These people need to go to church and get a life.
That's fine if you feel that way, but it's not OK to insist everyone else share your opinion. If someone's not hurting anyone, damaging property or the environment, you need to be more tolerant of their freedom.