It is important to first understand that the Church will not continue its investigation of Medjugorje until the apparitions of Our Lady are complete. But the last official statement by the commission of bishops set up to investigate Medjugorje declared in 1993: "We bishops, after a three-year-long commission study accept Medjugorje as a holy place, as a shrine.
This means that we have nothing against it if someone venerates the Mother of God in a manner also in agreement with the teaching and belief of the Church... Therefore, we are leaving that to further study. The Church does not hurry." (Glas Koncila, August 15, 1993).
We can also consider the words of Pope Urban VIII:
His Holiness, Pope Urban VIII stated: "In cases which concern private revelations, it is better to believe than not to believe, for, if you believe, and it is proven true, you will be happy that you have believed, because our Holy Mother asked it. If you believe, and it should be proven false, you will receive all blessings as if it had been true, because you believed it to be true."(Pope Urban VIII, 1623-44)
Our Lady has repeated over and over in Medjugorje that we are living in a time of grace, and anyone who opens their hearts to Our Lady and Jesus in these times will receive special graces to resist and defeat the evils and temptations of our world. While it is true that believing in any Marian apparition is not required as part of our faith, and is considered private revelation, passing up the incredible graces offered through these apparitions of the Mother of God is not something to be taken lightly. I have seen many Catholics who live a very faithful life and who obey all the rules of the Church that are completely changed as a result of visiting Medjugorje. Their lives are dramatically brought into a much deeper love of Jesus, Our Lady, and the Sacraments of the Church. The Holy Mass takes on a new intensity and they have a greater desire to pray, attend Eucharistic Adoration, and go to Mass more than just on Sundays.
Again, it is likely that the Church will not continue its investigation into Medjugorje until the apparitions of Our Lady there cease. Refusing to believe until Medjugorje is approved by the Church means passing up the incredible graces that are now being offered there to every single person on earth.