Yeah, it gets a little complicated.
Things like age, location were one was raised, teaching from parents, etc. play a part in ones
Younger theists (at least in my area) tend to be a little more open minded, but "faith"
is a very powerful thing, and requires constant "backing up" in the form of things like going
to church, which is like group theropy with the re-assurance of an authority figure (minister, preacher, etc.)
Show them this:
Not for creationism or anything, I just think people lack perspective.
Potholer54's "Made Easy" series on Youtube does an excellent job of explaining everything the origins of stars, planets, life, and the evolution of life:
In regards to showing the intelligence of other animals, here are some good videos about gorillas, chimps, and bonobos:
I have found that if someone believes that there is a god that created the whole world, then they do not value scientific data as proof of or disproof of anything. They believe what makes them feel good. So, instead of trying to help them understand the truth behind science, you need to stress the results of science and how they have changed that person's life as well as how science has changed society's standard of living. If you are a fair person or a detailed type person, you may feel the need to include the bad in with the good that science has done, but that would not follow the religious methods that trained that person to believe in a god that created the world.
Have a great day!