That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.
x = confess with thy mouth
y = thou shall be saved
Romans 10:9 says “if x then y”.
Philippians 2:11 says that x will be true for 100% of everyone, therefore y will be true for 100% of everyone.
This is a mathematical proof that everyone will be saved.