# the churches were strengthened in the faith and increased in number daily

This can be stated in active form. Alternate translation: "The believers became stronger in their faith, and there were more and more people becoming believers every day" (See: [[rc://en/ta/man/translate/figs-activepassive]])

# the churches were strengthened in the faith

This speaks of helping someone to believe more confidently as if it were making them physically stronger. (See: [[rc://en/ta/man/translate/figs-metaphor]])