the initial premise of your question is incorrect.
only those who are killed for refusing to sin are considered מת על קידוש השם
being killed for just bieng a jew just reduces the punishments after death because the pain of death and death itself is מכפר on some (but not all) of the עבירות and on this the גמרא says: מת מיתה משונה הוי ליה כפרה
for more resources on this topic see rabbi Yosef Mizrachi’s lecture on you tube.