Even the idea of believing refers to individuals since only individuals can exercise faith; I do not see anything in the passage that would indicate that this “all” is restricted to something like all people groups, including some who can be saved. I do not think the passage even hints that this “all” is different from “all” including each person previously spoken of as under sin; of which “there is no distinction.” This understanding corresponds precisely with its usage before and in the following verses.
Calvinism claims men are totally depraved in that they have no ability to respond to God unless and until God regenerates them or gives them spiritual life to THEN be able to repent and believe and be converted or saved. It is one thing to claim “no man come to God unless the Spirit draw him” and claim the necessity for regeneration for man’s response to God.
To be a consistent Calvinist, a person must believe that the Bible teaches God limits His redemptive love toward His creation and that limited love is more reflective of God being the sum of perfect love than God extending His salvational love to all of His creation. Of course, the perennial problem with the Calvinist’s perspective is the explicit claims of Scripture to the contrary.
Obviously, none of these uses of the word “dead” in Scripture imply “total inability.” Quite to the contrary, we often find that after people are described as being “dead” in one of the ways listed above, they are then invited in the following context to turn from death and practice life. So in passages like James 2:14-26 and Revelation 3:1-6, people are called to reverse their state of death by energizing their faith or repenting and returning to the way they used to live.