"..do they have to change their belief if they don't adopt?"
No, but it makes them appear hypocritical in many ways when they state this extreme concern for children and yet do nothing to help at least one of those children after it is born.
Or when they claim that women who abort are simply selfish and not wanting to put out the time to gestate and raise a child becuase it will change their lifestyle and yet the pro lifer also does not want to take the time to raise the child that does not have a home either.
I once asked a woman at the gate who was allways screaming "you can give it up for adoption" if she had adopted herself. She claimed her deep concern for the unborn came from the fact that she never was able to get pregnant. Her and her husband have a three bedroom house in a nice neighborhood of Wichita and good income and she does not work. She told me that she was too busy "saving babies" to adopt and raise one.
In other words it is easy to come out to the gate with her prolife friends for a couple hous aweek and yell at other women about how they should care about their unborn but when it comes to the post born the effort is just to much for her persoally to take on the responsibility.
In Kansas there are many many children that are waiting for homes that will never have them. There is no shortage of post born kids in need of parents. I also find it hypocritical that alot of these same prolifers that do not adopt themselves are the ones that are opposed to samesex couples that want to adopt doing so.
They want these kids to exist in theory but they do not want to do the actual grunt work it takes for these kids to grow up in a real home and then they want to prevent others who they do not approve of from giving these same kids a home. You can add on that many of the prolife camp are also hard line conservatives that fight any attempt at medical or social support by the government for these kids once they are born.
My husband and I would love to take in foster kids but have been told that becuae we are Pagan and becuase I work where I do that that is very unlikely we would meet the criteria. And here we have a farm with horses and other animals a good school near by and both of us love kids. (I guess we will just have to make do with the grannies on summer vacations).
It is easy to worship the preborn becuase it does not cost you anything personally that you are not willing to put out, but those darn postborn kids really do have actual needs that must be met and met for at least eighteen years plus they have their own personalities and can talk back and their primary goal in life is handing out brownie points for your concern. They can and will be critical and demanding and you can't just fold them up and put them in your car trunk like you can a fetus poster.