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Intelligent design is pretty much debunked by the fact that the eye is actually very badly designed and testicles hanging out on the out side are a bad idea. There's nothing intelligent about it.
Well... Sure, you can point to all kinds of flaws which wouldn't exist if each species was designed from scratch. Hair in your bum crack. But I've always felt a bit suss about the assertion that evolution is merely selection acting on random variation over deep time; despite the ridiculous amounts of time involved it still doesn't seem like enough to explain what we see around us, particularly symbioses and stuff.
And sure enough, in recent years Lamarck's reputation is beginning to recover; the inheritance of acquired characteristics is no longer off the table. But even that may be insufficient to explain the actual miracle of life, and perhaps it'll turn out that the hallucinating hippies are on the money when they say stuff about evolution having intent because the whole universe is intelligent...
@hugo7 didn't say that.
In itself, it's an idea with no credible evidence and no practical use (unless someone thinks praying is practical). Calling it a falsehood requires proving there's no God, for one thing, which is a bit tricky. It's the act of presenting it as having equal use and value to scientific theories that is worthless. If this all sounds like hair splitting, rational debate and intellectual rigour are the topic, here.
One part of the multidimensional space that is people's views on various axes is where most of this shit is ending up, even if it often doesn't start there. E.g. the "wellness" industry steadily morphing into ethnofascism.