I have a serious question for you.
Did you pray for Mr. Dawkins when the Holy Spirit urged you to?
I ask because in the above
IT LOOKS LIKE, the Holy Spirit urged you to pray for him 'that the Lord might save him yet', and then your personal view came in conflict with the Spirit of God as to who can be saved or not.
IT APPEARS you left off praying for him to re-affirm your Calvinistic view of what you hold, instead of praying for him and THEN going back to see if your view is correct which came in conflict with the urging of the Spirit.
Please understand, I am only asking because of HOW you set this forth and I am 'hoping' you prayed for Mr. Dawkins because I know in reading your post it urged me to.
I would like to say that maybe, just MAYBE the verse which came to your mind was God trying to showing WHY you need to pray for Him, or better HOW to pray for him.
But I am no prophet, so it makes no real matter what is between you and God.