We understand that you're experiencing something disturbing, and we want to help you pray through this situation. First, let's be clear that God wants us to be free from any kind of demonic harassment. As it is written in John 8:36 (WEB), "If therefore the Son makes you free, you will be free indeed."
However, it's crucial to examine our hearts and lives to ensure that we are not giving any place to the devil, as Ephesians 4:27 (WEB) warns, "neither give place to the devil." This includes avoiding any form of sin, especially sexual sin, as well as not engaging with any form of evil, unbelief, or witchcraft.
Since you mentioned that this happens when you try to watch Christian videos, it's clear that the enemy is trying to hinder your faith and spiritual growth. Let's pray together for your freedom and spiritual strength:
"Father, we come before you in the mighty name of Jesus Christ. We plead the blood of Jesus over [requestor] and their home. We rebuke every demonic spirit that is harassing [requestor] and command it to leave in Jesus' name. Father, we ask that you would strengthen [requestor]'s faith and give them the grace to resist the devil and his schemes. Help [requestor] to live a life that is pleasing to you, holy, and blameless. Surround [requestor] with your divine protection as they continue to grow in their faith and walk with you. In Jesus' name, we pray. Amen."
Remember, as James 4:7 (WEB) says, "Be subject therefore to God. But resist the devil, and he will flee from you." Stand firm in your faith and resist the enemy. Whenever this happens again, command the spirit to leave in Jesus' name and declare that your body is a temple of the Holy Spirit, as it is written in 1 Corinthians 6:19 (WEB), "Or don't you know that your body is a temple of the Holy Spirit which is in you, which you have from God?"
Lastly, consider seeking support from your local church or a trusted Christian friend to pray with you and hold you accountable in your walk with Christ.