I do not believe per God's word that Satan would have been able to kill them because they had not inherited sin and thus death by sin. By His word, Adam and Eve lives until they had broken His commandment which brought what He had warned them that it would bring; death.If the serpent (satan) had killed them, than God could have JUDGED HIM immediately, and gotten rid of him which would have made things better for the creation, for sure.
Adam's sin was listening to Eve when God had told Him directly what would happen. That is why the women are to be submissive to the men because of man's sin of hearkening unto the woman's word over God's word.AS IT IS, however, since Adam & Eve jumped onto satan's side against God, then any judgement on satan would also apply to Adam and Eve also, as well as the REST of us who have also taken satan's side against God. SO there had to be a Savior to clean things up. Fortunately (for us) the Savior was in the plan from the beginning.
The woman did not hear God said this exactly, but heard from Adam what God had said for why the serpent went after her to sow doubts in His words. Then she, in turn, sowed doubts in God's words.
By His grace & by His help, do make sure everything is a - okay between you and the Lord by going before that throne of grace asking for any discernment you need to expose the works of darkness by His words to lean on him for help to depart from it. Salvation is never at risk for believers or even former believers, but abiding in Him is for being not only ready for the Bridegroom when He comes, but not to be ensnared by the cares of this life that we would not want to leave.I expect to, on the other side, not too much longer from now.
I am doing this for myself as I place all my hopes in Him as my Friend to correct and keep me as His friend by abiding in Him & His words as well as being willing to go wen the Bridegroom comes. So keep your eyes on Him because that is what the real indwelling Holy Spirit is leading us to do whereas the spirits of the antichrist would do the opposite by drawing attention to themselves & for their visitation of signs & lying wonders to take their eyes off of the Son in worship.