Well thats useless. If they believe in it without understanding it then science is no better than religion.
Except the science isn't the problem. Their lack of understanding isn't coming from the fault of science, its coming from a willful ignorance. Effectively what it is saying is that religion has so poisoned the well of human logic, that it has made a large portion of the population unable, or at least unwilling, to use logic properly. They might see the rampant excessive flaws in logic by full blown religion and thus less supportive of it, but they're still indoctrinated in that type of thinking, so they might change their beliefs, but the way they approach those beliefs is still the same. They never actually learned it, they just learned to believe it.
Also, there's tons of evidence on this forum alone of people picking and choosing what science they believe. I think that stems from what people learn. Take for instance, we have more than a few people on here, that are perfectly fine learning and accepting the logic of computers (even in depth stuff like programming), but don't believe in evolution because they've never really learned the logic behind it. Or they've been taught the bastardized logic of creationists, and aren't willing to change that. Computers is something they often got started learning on their own or with friends while growing up. They often didn't really learn it in an official capacity through school (or if they did it was simpler stuff, and the things that fueled their actual understanding was sort of rebellious, like learning how to install Doom so you could play it in typing class, or something like that). The important thing is that they learned it in a different manner than they learned most things, which is why they're accepting of it. Most people don't have that experience with biology and evolution (and fewer still have any desire for that). Its easier to just accept what they were taught (for even practical reasons, that learning, especially as you get older becomes time consuming and often doesn't pay off meaningfully - it won't help you advance at work, it'll take time from playing games/dating/etc).
Why does god need to be included in this? There is literally no need to add an unproven entity into this.
For some people there
is a need for Him to be there. And this is such a big "question" that it would throw their entire life into chaos just questioning it, because so much of a lot of peoples' lives is based around this mental construction. And that's for people that just grew up religious, and not people who it is all consuming in their lives.
Also for these people, its not them adding this entity, its you trying to remove it needlessly. If it doesn't matter, then why are you so adamant about taking it away? That's how the logic was constructed for them, and you trying to change that little piece from that situation requires them fundamentally changing their belief and logic structure for everything.