1. Physical deathYou do realise that we are part "fallen humanity" that god sees as now being found "In Adam?"
As such, we are born under the Curse, judgement of God, so that we will experience physical death and are born spiritually dead!
2 seperate 'deads"
For as the body without the spirit is dead, so faith without works is dead also. (James 2:26)
--When the spirit separated from the body, that is death. Death is separation.
2. Eternal death.
For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord. (Romans 6:23)
--death and life are contrasted here: eternal death to eternal life. It is a parallel. As the gift of God is eternal life, so the wages of sin is eternal death. One is eternity with God; the other is eternity separated from God.
Death is separation.
3. Spiritual death.
And you hath he quickened, who were dead in trespasses and sins; (Ephesians 2:1)
--They were dead; now they are alive. They were not corpses or lifeless.
They were separated from God because of sin. Now, through the Holy Spirit, they are made alive. Death means separation. Sin separates.
4. The same holds true for a believer.
If I regard iniquity in my heart, the Lord will not hear me: (Psalms 66:18)
--Sin will separate you from God. God will not hear your prayers. Sin will keep you out of fellowship with God until you repent and confess your sins to Him (1John 1:9)
5. The Second Death
And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works. And death and hell were cast into the lake of fire. This is the second death. (Revelation 20:13-14)
--It is the final sentence of all the unsaved. They, once and for all, will stand before Christ and face their final sentence. They will be forever separated from Christ in the Lake of Fire. Death is separation.
Death is always separation in the Bible. It is not equated as lifelessness.