# it is an aroma

"the knowledge of Christ is an aroma."

# an aroma from death to death

Possible meanings are 1) that the word "death" is repeated for emphasis and the phrase means "an aroma that causes death" or 2) "an aroma of death that causes people to die" 

# the ones being saved

"the ones whom God is saving" 

# aroma from life to life

Possible meanings are 1) that the word "life" is repeated for emphasis and the phrase means "an aroma that gives life" or 2) "an aroma of life that gives people life"

# Who is worthy of these things?

'Who is worthy to spread the knowledge of Christ?" or "It is amazing that anyone is worthy of these things!"