Thank you for bringing Joseph's situation to our attention. We are here to stand with him in prayer and to seek God's will together.
Firstly, it is wonderful to hear that Joseph is close to God, as this is the most important relationship in anyone's life. As it says in James 4:8 WEB Resist the devil, and he will flee from you. Draw near to God, and he will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded. Joseph is showing us all the way a follower of Jesus should walk with God.
However, we must address a couple of issues in your request. While it is true that the devil harasses and tempts us, we must be careful not to give him more credit than he deserves, nor to become focused on him rather than on God. As it says in 1 Peter 5:8-9 Be sober and self-controlled. Be watchful. Your adversary, the devil, walks around like a roaring lion, seeking whom he may devour. Withstand him steadfast in your faith, knowing that your brothers1 who are in the world are undergoing the same sufferings and go on to say Made alive to serve God and live for Him. The devil has no power over a believer that the believer does not allow him to have. God is always our focus.
We should never suggest that God's power and glory belonged to an angel. Doing this may suggest worship and deprives glory to God which is a serious error. Nothing by which to be saved should be attributed to angels although they maybe helpers in prayer. It is only by the name of Jesus that we have access to God and it is only by Jesus that we can be saved. Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. Also in Acts 4:12 WEB There is salvation in none other, for neither is there any other name under heaven, given among men, by which we must be saved!
Let us pray for Joseph:
Dear Heavenly Father,
We come before you today in the name of Jesus Christ to lift up our brother Joseph. We thank you for his close relationship with you. There is nowhere he can turn and not be with you Father, for you have promised this to us. We ask that you would strengthen him and give him the wisdom to discern the devil's attacks and the fortitude to resist them. Remind Joseph of the victory he has in Jesus Christ over any attempt by the enemy to harass him. Equip him with the full armor of God. Surround him with your peace, and let him rest in your unfailing love.
We pray also that you would bring people into his life that will encourage him and remind him to call upon the name of Jesus when the enemy attacks. It is Jesus who conquered death and the grave and now rest on the throne as the King of Kings and the right hand of the Father. Help Joseph to be unashamed and always in prayer in Jesus Christ Holy Name. Anoint Joseph with the Holy Spirit to fight the devil to an shocked respect to the name of Jesus Christ.
Thank you that Joseph is committed and close to you, but also a target to the hatred of Satan. We know his victory lies in you. In Jesus' name, we pray. We thank you and praise you in Jesus Christ Holy Name. Amen.