# For otherwise
"For if your presence does not go with us"
# how will it be known
"how will people know"
# how will it be known ... people?
"no one will know ... people."
# I and your people will be distinct
"everyone will know that I and your people are different." The words "be distinct" translate the same Hebrew word as "set ... apart" in Exodus 8:22, so if your language has one word or phrase for both ideas, you may want to use it there and here.
# Will it not only be if
"Will it not only be known if"