Ruth is referring to Naomi's people, the Israelites. AT: "I will consider the people of your country as being my own people" or "I will consider your relatives as my own relatives" (See: [[rc://en/ta/man/translate/figs-explicit]])
This refers to Ruth asking God to punish her if she does not do what she said like the english idiom "God forbid, if." (See: [[rc://en/ta/man/translate/figs-idiom]])