I suppose the bible isn't a science book. So yes, it deals with the "why". But if we are creationist, and keep it to ourselves, would that be okay? How do our beliefs about what happened in the past, effect the truth of what happened anyway? It's just an alternative to believing evolution.
Science makes it so that things like the bible cannot be involved. I think I understand why. It deals with the "how", and if it included what it sees as "religious texts", then what's to stop every text being included?
So, the debate is because creationists still think creationism is what actually happened. If it is what happened, then you can see why they have "tried" to spread it. It's a bit like belief. You might say you have no reason to believe, but what if it is the truth anyway? I guess science is a useless way to convince people of God, in a
way anyway.
It's like the mechanics on a motorcycle, either you are interested in how it works, or you are interested in why it works. I suppose there are two groups, the "hows" and the "whys". I would want to ride the bike, whereas someone else might want to know how it works. Telling them, "It works because I like riding it" might be useless to that person.