Who lied?

Ever since I began reading the Bible, one of the earliest stories I was read to in various narratives as a child was the story of Adam and Eve in the garden of eden. Even as a grownup and reading the passage several times, the essential facts of the story haven't changed as I knew them.

After creating every living thing,  God created Adam and watched him name all the animals one by one. He then created Eve having confirming that Adam alone had no partner of all animals created. Adam was overjoyed and named his partner woman.

Before doing this though God, while placing Adam in eden, had permitted him to eat from all the trees in the garden. All the trees, that is, except one. The tree of the knowledge of good and evil (carnal knowledge). Adam was warned that eating from the tree of carnal knowledge would cause him to "surely die".

The serpent then deceived Eve and she ate the fruit and also gave Adam some to eat. The serpent had told Eve that they would become like God after eating the fruit, assuring them that they wouldn't die.

After eating the fruit though some points became obvious to me as a child.
The first was that they didn't drop down dead. So it seemed to me (though I never told anyone) that God had lied to Adam. Or perhaps he had been merciful by not allowing them both to die. So the serpent had been partly truthful it meant.
The second point was that they obviously didn't become like God. So the serpent had lied in his second assertion.

Therefore in my understanding at the time, both of the parties (God and the serpent) hadn't been 100% truthful. Recently though the Holy Spirit began to open a new chapter of understanding to me about the implications of Adam's (and subsequently mankind's) fall.

In Genesis 2:7a the Bible said God formed Adam from dust. At this time he was lifeless until the second part of that verse said God breathed life into him, and he became a living person. The life that was breathed into the man was his spirit. Job 33:4 alludes to the "breath of the almighty" being a man's spirit. Immediately God breathed into Adam, he came alive. At that time in the garden, the Bible let's us know they were both naked and they weren't even aware of it! In other words when they were alive (spiritually alive that is), their physical conditions had no effect on their wellbeing.

But something curious happens once they ate the fruit. For one they realize they are naked. And uncomfortable with this situation, they quickly rectify the 'problem' with leaves. Since they were alive and had neither knowledge they were naked nor it's implications before eating the fruit,  it must follow that their (spiritual) death is somehow signified by their awakening to their physical plight.

Small wonder the Bible says in Romans 8:6 (KJV) that "to be carnally minded is death, but to be spiritually minded is life and peace" . In switching from spiritual life to carnal awareness, Adam and Eve chose death over life. Thus God evicted them from eden and barred their access to the tree of life.

Galatians 5:16 " So I say, walk by the Spirit, and you will not gratify the desires of your sinful nature". How do we then walk by the spirit?