God didn't stop Adam and Eve in the Garden when they made the wrong choice, but He punished them. This is the whole idea of the whole Bible from the Garden of Eden to the Book of Revelation, free choice, your choice! This is why Man was put here: To make a choice between good and evil, to do right or wrong, to serve God or himself and the Devil.
It's almost like a great experiment that God is conducting to show the rest of the Universe what happens if anyone is allowed to have their own way and go without God. It's like a great lesson to all the Spirit World, to give them all a good sample of what is right and what is wrong, and how that right pays off and wrong pays off too!--Which is why God is now allowing Man, by his own hand, to bring the Earth from the Heaven on Earth that He originally created, to literally a state of the horrors of Hell.--To be a demonstration to the whole Universe and all Heaven of what a horrible mess results when His creations rebel against Him!
So God has a reason for it all, and one of the main reasons is to give us a chance to make a choice. Are you choosing God's way?--Or your own! Go God's way!