Were there not other sins like telling lies that Adam and Eve could have committed other than eating of the Tree of Knowledge of Good and Evil?

Actually, no. Before Adam ate of the fruit of the Tree of Knowledge of Good and Evil, there was no sin in the world. Sin entered the picture because of Adam's disobedience and his eyes being opened to good and evil through eating of the fruit of the forbidden tree. After eating of the fruit, Adam opened the door to all sin. In that respect, a whole array of sins could have been committed. It just happened that lying occured before the other sins. Deb