No, you probably don't. It was tried at a college, where they taught from the famous "Pandas" ID book, then proceeded to debunk it entirely and present evolution. A control group of students were just taught the standard evolution course.
The result was that where "both" were taught, the students had rejected ID (would they now reject their faith too?). The group taught evolution had a lower number who believed it after the course was through, no doubt because they had heard about this controversy and just thought they were being presented junk.
Now if "both" were taught, just how do you think many science professors would teach it? You know good and well many would not leave the conclusion to the students, but would present ID merely in order to debunk it. And as the test shows, that tactic works well.
Jeb Bush said he thinks both should be taught and I'm very glad he said it. Of course, others disagree. But I'm not sure it actually lost him any votes
Jeb backed away from the subject almost immediately. Someone must have clued him in.
People can argue about the Schivo case pro and con forever. There really isn't a "correct" answer, because it just comes down to how one feels. So it's not likely to cost Jeb many votes, except for those looking for reasons to vote against him anyway.
But evolution is different. There are many people, even many Christians, who think that people who don't believe evolution also think the earth was created in 7 days, and therefore they are as dumb as bricks. Whether it's true or not is irrelevant. I'm just telling you that a large number of people, many of them conservatives right here on FR, actually believe that anyone against evolution is dumb as a brick, and they will refuse to vote for them for that reason alone.
I don't necessarily think such people are "dumb" per se, except that they're dumb politically for talking about creationism, and that's just as good a reason to vote against them as otherwise. If they're dumb enough to make that kind of political mistake, then they'll make more.