Adam and Eve were created innocent not "sinless',as you correctly noted there was no such thing as sin in the world when they were created.But there was a sinful, rebellious Lucifer in that garden
God put the snake (satan) in the Garden ..if God wanted Adam and Eve to remain in the created innocence He could have put the snake outside the garden.
God put the temptation in the garden. If God wanted them to remain innocent, He could have placed the trees outside of the garden.
God knew that Adam and Eve would succumb to the sin of pride, just as Lucifer did .. God knew this before the foundation of the world.he had already ordained a Savior for the sin of men. If this was not a part of Gods desire he could have kept them in innocence .
What so many fail to understand is the Fall, like all things, redounds to the glory of God..
Without the fall, we would never know or understand the Holiness and righteousness of God, we would never have seen His justice or mercy ...the creation is not about the creation, it is about the creator .
Ultimately JESUS came to seek and to save that which is lost through sin. He came because His Father so loved the world..."For God so loved the world that He gave His one and only Son, that whoever believes in Him shall not perish but have eternal life."
I thought you said He came to restore man dominion over the world???