Your new life is a reigning one. You have been empowered by the grace of God and by the gift of righteousness to reign in this life: reign over sicknesses and diseases.
Asking for healing isn’t the prayer of faith rather, acting on your belief in the word by saying the exact word of God is. Faith is believing and acting on the word of God.
Prayer is a reverential communication with God. This is different from how you communicate with your friends or earthly parents. It is done reverentially, with a knowledge of who God is.