Adam’s Trespass

But not as the trespass, thus also is the gracious gift. For since by the trespass of the one [man] the many died, how much more the grace from God and the gift by grace by the one man Jesus Christ abounds unto the many. - Romans 5:15
Since it has already been states that physical death is from sin, and a sin and a trespass are two different things (Ephesians 2:1), this cannot be referring to physical death. The only other type of life we humans possess is spiritual life. This is a life that is connected to God. Adam's trespass separated him from God, resulting in his rational, logical part no longer being able to understand the things of God. He then passed this down to his offspring, so we are all born separated from God.