10:17a

faith comes by hearing: The words comes by indicate that hearing is necessary before faith can begin. Here are other ways to translate this clause:

faith comes from what is heard (Revised Standard Version)
-or-
all who did believe, believe because they heard the word they were told
-or-
man[kind] must first hear the news and only then can they believe.

faith: This word refers to believing in Jesus, that he is the Christ, the one whom God sent to save people from his anger. See how you translated this word in 10:6.

10:17b

hearing by the word of Christ:
The word “comes” is implied here from 10:17a. Use the same word, phrase or grammar as you did there.

by the word of Christ: Here the word by indicates that someone speaks the word of Christ and others hear it. Here are other ways to translate this phrase:

through the word of Christ ⌊being spoken⌋
-or-
through preaching Christ (Good News Translation)

the word of Christ: This phrase refers to the teachings about Christ. In many languages the word of allows for that meaning. Other languages must translate without of for the correct meaning. For example:

the word about Christ (New International Version (2011))

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