When people are confused or blinded from the truth, they need our help in prayer. Praying for people in this state can have tremendous results. But, we must pray according to the word. Now we can not pray against someone else's will, but we can pray that they see the truth. Below is an expanded translation I did from Ephesians 1:17-19. I hope this helps you in your prayer time for others!
My prayer for you is that the God of our Lord Jesus Christ, the Father of goodness would impart to you supernatural insight, and jerk off the covers that blind you so you can see Him as He truly is, and become fully acquainted with and know Him.