Question: "Were Adam and Eve saved? How many children did Adam and Eve have? When were Adam and Eve created?"
Were Adam and Eve saved? The Bible does not specifically tell us whether Adam and Eve were saved. Adam and Eve were the only two human beings who knew about God before they became tainted with sin. As a result, they likely still knew God better after their fall than any of us do today. Adam and Eve most definitely believed in and depended on God. God continued to talk with Adam and Eve and provide for them after the fall. Adam and Eve knew of Godís promise that He would provide a Savior (Genesis 3:15). God made garments of skin for Adam and Eve after the fall (Genesis 3:21). Many scholars understand this as the first animal sacrifice, foreshadowing the eventual death of Christ on the cross for the sins of the world. Putting these facts together, it would seem that Adam and Eve were saved and did indeed go to heaven / paradise when they died.
How many children did Adam and Eve have? The Bible does not give us a specific number. Adam and Eve had Cain (Genesis 4:1), Abel (Genesis 4:2), Seth (Genesis 4:25), and many other sons and daughters (Genesis 5:4). With likely hundreds of years of child-bearing capability, Adam and Eve likely had 50+ children in their lifetime.
When were Adam and Eve created? If Old Testament history and the ages in Genesis chapter 5 are traced, Adam and Eve were likely created in approximately 4000 B.C.
Were Adam and Eve cavemen? Genesis chapter 3 records Adam and Eve having a fully intelligent conversation with God. Adam and Eve were surely "primitive" in their understanding of many concepts, but they were not "ape-like" or intellectually deficient by any means. Adam and Eve were the most perfect human beings in the history of the world.
How long were Adam and Eve in the Garden of Eden before they sinned? The Bible does not explicitly tell us how long Adam and Eve were in the Garden of Eden before they sinned. It seems as if they were in the Garden for a short amount of time, possibly as little as a day or two. Adam and Eve did not conceive any children until after the Fall (Genesis 4:1-2), so it is unlikely they were in the Garden for very long.
Did Adam and Eve have belly buttons / navels? A belly button (or bellybutton) is formed by the umbilical cord that connects a baby in the womb to its mother. Adam and Eve were created directly by God, and did not go through the normal birthing process. So, Adam and Eve would probably not have had belly buttons / bellybuttons.