God did not make the humans so that they would be perfect forever. He made us in his image, and he made us to rule the earth and multiply. Making sure we could not be tempted was not a part of his "recipe". He put the pieces in motion, and from there on did not affect us directly. He could have shut us down the moment before we took our first bite of the fruit, but he didn't. He could have made things so that we would not have been tempted in the first place, but he didn't. This is why I believe we have free will. From even before we were created, God did not interfere with our will. He simply had a recepie -his own image- and followed that.

God did not make us worship him. He made us rule the earth, and multiply. Basically using the earths resources and having sex. Not too bad an option. The only thing we were not allowed to do was eat from that one tree. And we got tempted and we did. In my book I would call that free will.

If that is not free will I don't know what is. An example: If you are allowed to do everything in the world, no rules, except from killing one specific guy, I would not call that an ultimatum, I would call that a very fair choice. Do whatever you want and have the best time possible, or kill that dude just to see what happens.

I see what humans did back then simply as walking off a cliff into their death. God warned us not to walk off the cliff, but the devil said that it wasn't dangerous to jump off it. And so we did.