Creationism is not a fringe idea! I think that illustrates the major flaw of your mindset. If you screen off entire categories of ideas as not worth thinking about, you're going to get a systematically incorrect view of the world.
When people discuss creationism they're usually talking about Young Earth Creationism which is absolutely a fringe idea
> When asked the single-question version, just 18 percent of U.S adults say humans have always existed in their present form, while 81 percent say humans have evolved over time.
For example, most of these folks wont say the Earth is 10,000 or 6,500 years old. When asked they'll say the planet is much older.