Answer
The only according to scriptural accounts of God physically with Adam is in Genesis.
Genesis 2:7 - Then the LORD God formed the man out of the dust from the ground and breathed the breath of life into his nostrils, and the man became a living being.
Genesis 2:15 - The LORD God took the man and placed him in the garden of Eden to work it and watch over it.
Genesis 2:21 - So the LORD God caused a deep sleep to come over the man, and he slept. God took one of his ribs and closed the flesh at that place. 22 Then the LORD God made the rib He had taken from the man into a woman and brought her to the man.
Genesis 3:8-9 - Then the man and his wife heard the sound of the LORD God walking in the garden at the time of the evening breeze, and they hid themselves from the LORD God among the trees of the garden. 9 So the LORD God called out to the man and said to him, "Where are you?"
Genesis 3:21 The LORD God made clothing out of skins for Adam and his wife, and He clothed them.
Here we have the LORD God forming the man, breathing into his nostrils, leading him, teaching him, performing surgery, forming a wife for the man, walking in the garden, seeking man, speaking to man, and forming clothing for man. All of these are very personal acts.
The LORD continued to make physical interactions with mankind in the Old Testament [for instance, He appeared as "The Angel of the LORD" to Hagar in Genesis 16:7-13 and Gideon in Judges 6:11-23 and as a man to Jacob in Genesis 32:28 [Note that Jacob was surprised in Genesis 32:30 to have actually see God face to face and live.]
In the account with Moses in Exodus 33:20, where God said "said, Thou canst not see my face: for there shall no man see me, and live", it is very important to look closer at Moses' request.
Moses in Exodus 33:18 asked "Please, let me see Your glory." This is not merely requested for God's presense but to see the complete fullness of the Godhead. The fullness of the Godhead, God's glory, would be unrestricted and
because His nature is all-powerful, sovereign, holy and just it would naturally be dangerous to sinful man. This is why the LORD said no one could see his face and live.
Answer
When God walked with Adam & Eve, they had not commited sin. The God I believe in cannot look upon sin. And we are born into sin because of the wrong Adam and Eve did. Not doing as God had commanded. Being born into sin is to be born into flesh. When they were cast from the Garden Of Eden that ended the visual relationship with men of flesh.
Exodus 33:20
33:20 And he said, Thou canst not see my face: for there shall no man see me, and live.
Can God be seen? see link
Answer
Maybe Adam & Eve did not die because God showed them not His face, but His behind?
Exodus 33:22 And it shall come to pass, while my glory passeth by, that I will put thee in a clift of the rock, and will cover thee with my hand while I pass by: 33:23 And I will take away mine hand, and thou shalt see my back parts: but my face shall not be seen.