Hi ArtsieSteph,
The Bible says that our battle is not against flesh and blood, but against the spiritual forces, the principalities, powers and rulers of this dark world. There is nothing you can say that will "convince" your dad, unless those spiritual forces have been cut down and cast out. And not just the spirits of deception that are interfering with his salvation, but also the forces of sickness, OCD, poverty, and any other vile thing that is stealing, killing, or destroying your lives.
In the name of Jesus, and by his authority, I BIND the evil that is coming against ArtsieSteph and her family. I STRIP them of their power to inflict illness, mental illness, OCD, deception, anxiety, worry, fear, anger, resentment, and any other evil thing--I BREAK those chains of sin and darkness in their lives, but the authority and blood of Jesus, shed for our atonement and for our victory over all the powers of darkness. Glory to GOD!!!
ArtsieSteph--pray prayers of spiritual warfare at least daily. We can bind and cast out the demons, but the Bible says they can come back. Be diligent in defending yourself and your family, putting on the armor of God daily, brandishing your sword of the Spirit (the Word of God) always walking in righteousness so that nothing will hinder our prayers or keep us from the fullness of God.
Father God, not only do we bind the powers of evil, but we invite your holy spirit to invade their lives. Father God, rain down a full anointing of your holy spirit, baptizing them in fire, manifesting your presence through their words, actions, and lives! Fill them with the light of your glory from the inside out, so that all who see them will testify that you are God to the glory of Jehovah God and Jesus Christ!! Father God, where light is, darkness flees, so we ask that you cover them so completely in light that the darkness flees from your presence. Let it be that darkness can't get anywhere near this family Lord, so that you can do a complete and unhindered healing work in their lives.
Father God, teach ArtsieSteph and her family how to take their authority in Christ. From her posts I see a lot of fear. God, we know that fear is the opposite of faith, and though there is no judgment against her because of the blood of Christ, we also know that she can't walk in confidence and glory when she has fear in her heart. So Father God, I ask that right now you render fear defeated! Strip that out of her heart, her head and her life, and in the name of Jesus replace it with the type of faith that can move mountains! Let her stand up, head high, in the full confidence and authority of Jesus Christ. Romans 8:31 says that if God is for us, who can be against us! Let her proclaim this victory from the very depths of her soul, and believe and know, fully and truly know, that YOU are God, and She. Is. Your. Daughter.
By the power, blood, and name of Jesus I proclaim this to be true! Amen and Amen!!!!