Here it goes:
Thank you for loving Isaac so much that You gave Your one and only Son, that when Isaac believes in Him, he will not perish but have eternal life. (John 3:16) We pray that Isaac will trust in You and never be shaken. (Psalm 125:1) We pray that he will repent of his sin and confess with his mouth that Jesus is Lord. We pray that he will believe in his heart that You have raised Christ from the dead. Guide Isaac to call on Your name Lord, and save him. (Romans 10: 9,13.) We pray that Isaac, being rooted and established in love, may have power, together with all the saints, to grasp how long and how wide and how high and how deep is the love of Christ, and to know this love that surpasses all understanding, that Isaac may be filled to the measure of all the fullness of God. (Ephesians 3: 18-19)
I believe two things that may seem incompatible. I know that each one of us comes to God of our own free will and choice, and we cannot pray another person into Heaven ourselves. I also believe what God has promised in 1 John- that whatever we ask according to His will, we will have what we have asked. My children's salvation is well within the will of God. I pray that God's love will be so overwhelming to my children that He will be found irresistible. I have no idea what it would feel like to have an adult child living outside the will of God, but in Jodie Berndt's book, she states, "God wants our children to be saved. When you pray for your children's salvation, you can be confident that you are praying in accordance with God's will." She references 2 Peter 3:9, "The Lord is not slow in keeping His promise, as some understand slowness. He is patient with you, not wanting anyone to perish, but everyone to come to repentance."
I John 5:14-15 This is the confidence we have in approaching God: that if we ask anything according to His will, He hears us. And if we know that He hears us, whatever we ask, we know that we have what we asked of Him.