Garden of Eden was a setup...

[Esquilax]

But I'm amazed at how many people still do defend it.

Why do I need to defend God? If that's what he wanted to do then he could do it. Who knows? Maybe there actually was a good reason for what he did.

Ah, the appeal to vague possible reasons again. Or, more fairly, the presupposition that there was a good reason for every bad thing god has ever done. It's not even actually an argument, and can be summarily dismissed; if you don't know what the good reason was, you are not rationally justified in believing there was one. That which is asserted without evidence, can be dismissed without evidence.

Obviously, he wanted to test Adam and Eve, and they failed the test. Fortunately, he also decided to redeem them.

Why does an omniscient being need to test anything if he already knows the outcome? For that matter, why does a god capable of creating anything he wants create a being that requires testing at all, or for which a failure state is even possible?

This is just you making up ad hoc excuses for what's present, not a logical progression of events that actually happened. In the real world what you're claiming just would not make sense as a chronological series.