# If now I have found favor in your eyes

"Now If you are pleased with me" or "Now if you approve of me" 

# our iniquity and our sin

"all our sins" 

# take us as your inheritance

"take us as the people that you possess forever" or "accept us as the people who belong to you forever"

# this people is stiff-necked

"this people is stubborn" or "this people refuses to change"