I am not familiar with this prayer word-for-word formily as “Miracle Prayer” but it is in essence very similar to what separated bretheren i.e. “protestants” refer to as, “The Sinners Prayer”. A prayer similar to this is prayed during evangelistic alter calls but of course without the petition to Mary, angels and saints for intercession. It may be a prayer who’s origins are from a devout Catholic convert from other Christian tradition who’s intention is evangelization from a Catholic perspective. Conversion is a miracle. Faith is a miracle. Repentence is a miracle. Obediance is a miracle. I would have no doubt that miraculous grace from God will be experienced by praying this prayer in faith.
I prayed a prayer to similar to this with Jim and Tammy Fae (RIP) Bakker while watching The PTL Club in early 1983 which began my faith journey to Catholicism which will be fulfilled at the Easter Vigil this year as I will be confirmed and receive first Holy Communion.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.