Why do we pray the Lord’s prayer? Well a good reason is given in the Catechism of the Book of Common Prayer:
Question. What desirest thou of God in this Prayer?
Answer. I desire my Lord God our heavenly Father, who is the giver of all goodness, to send his grace unto me, and to all people; that we may worship him, serve him, and obey him, as we ought to do. And I pray unto God, that he will send us all things that be needful both for our souls and bodies; and that he will be merciful unto us, and forgive us our sins; and that it will please him to save and defend us in all dangers ghostly and bodily; and that he will keep us from all sin and wickedness, and from our ghostly enemy, and from everlasting death. And this I trust he will do of his mercy and goodness, through our Lord Jesus Christ. And therefore I say, Amen, So be it.