This refers to Jesus. Possible meanings are 1) "the one who gives people eternal life" or 2) "the ruler of life" or 3) "the founder of life" or 4) "the one who leads people to life"
The one who makes people live is spoken of as if he were the one who puts down the stones on which others build houses or other buildings. AT: "Giver of life" or "Creator of life" or "One who makes people live" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This word, "Now," shifts the audiences' attention to the lame man.
# by faith in his name
Here the word "name" refers to Jesus. Possible meanings are 1) "because this man believes in Jesus" or 2) "because John and I believe in Jesus" (See: [[rc://en/ta/man/translate/figs-metonymy]])