What would make the death of Christ in vain?

Answer

"If righteousness come by the law, then Christ is dead in vain." Gal. 2: 21.

In what literal language is this persecution of the people of God further described?
How fully does the Lord pardon when one repents?
For whose sake did Christ say the period of papal persecution would be shortened?
What reply did Christ make?
What illustration of this is given in the Bible?
How long will they reign?
Through Christ, what has been opened to the house of David?

Questions & Answers are from the book Bible Readings for the Home Circle