God has eternal life... there is no darkness in God, so the only kind of life He could possibly give to Adam and Eve is eternal life.
They lost that eternal life due to SIN.... that same as lucifer who also had eternal life before he decided one day that he had the desire to lift himself up above God and become the supreme ruler... that was sin and itr caused him to fall from being in right standing with the Lord just like Adam and Eve.
Where the OSAS peoples (includes eternal security) fail is they REJECT God's Word!... God is NOT mocked... whatsoever a man sows, that shall He also reap he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting. (Galatians 6:7-8)
They'll agree that when one is born again they did sow to the spirit and reaped life... but then they deny and ignore the rest of Galatians 6:7-8 claiming if one sows to the flesh (sins) they do not rep corruption.
In Gal 6:8, the word corruption is...
G5356
fthora from G5351; decay, i.e. ruin -- corruption, destroy, perish.
G5351
strengthened from phthio (to pine or waste); properly, to shrivel or wither, i.e. to spoil or to ruin, by moral influences, to deprave): -- corrupt (self), defile, destroy.
If one claims we DO reap corruption when we sin, then they are admitting they do not believe OSAS / Eternal security doctrine (and sadly many of their friends will forsake them!).... and if one claims we DO NOT reap what we sow, then according to Gal 6:7, that is mocking God!
The OSAS peoples don't know that salvation is on God's terms and what Jesus did at the Cross of Calvary... does not eliminate or do away with seedtime and harvest. God is not mocked!
In Jesus' classic teaching on sowing and reaping, He said "Know ye not this parable? and how then will ye know all parables?" (Mark 4:13)
God created man in His Image, therefore just like God... mankind reaps what he sows and is responsible for the seeds he plants. If man does good, he'll receive good... if he does evil, he'll receive evil.
Romans 2:9-11
Tribulation and anguish, upon every soul of man that doeth evil, of the Jew first, and also of the Gentile;
But glory, honour, and peace, to every man that worketh good, to the Jew first, and also to the Gentile:
For there is no respect of persons with God.
It's too bad for all the OSAS, eternal security, calvin's people, martin's peoples.... obviously God's Word just work for these folks so they are off following the teachings of man instead. That's too bad, it really is.