Remember the only perfect one is God, in the Christian community are many false prophets who are there for that purpose to discourage other Christians, and destroy the work God is doing on us. Concentrate on Jesus and Him alone the only one who can fight these battles for us. Get into reading the bible and stop thinking of the past, when you accepted Jesus Christ as your Savior you have become a new creation in Him. Only by the blood of Jesus can we be cleanse from our past sins.
Lord give this child of yours the strength they need to resist the enemy, and to keep his/hers eyes only on you. We supposed to go to church to worship you, and listen to a good sermon encouraging us to keep serving you no matter what comes our way. Help this person become victorious in Christ, make him/her strong in you so those bullies can see You are in this child of yours and stop the harassment. I pray in the mighty name of our Lord Jesus Christ. Amen!