Sean, Paul's words of
Ephesians 2:2 & 5, that is, the phrases "who were dead in trespasses and sins" and "we were dead in sins," are what we refer to as "figures of speech," a word or phrase for one thing that is used to refer to another thing in order to show or suggest that they are similar.
If Paul was stating that we were truly "DEAD," then what possible way would the likes of you and I ever had to even come to an understanding of our lost condition or to petition God for forgiveness? Are the dead capable of thought, speech, or the ability to speak? Of course not! So we see we were NOT literally "dead" in our sins, else we would have been rendered utterly incapable of even knowing that we were lost sinners!