First I would like to say that I am ammused in your attempt to "attack" the Church, you have tried in many different ways, when all else fails you open a new thread.
I also would like to say that the Catholic Church does not require the faithful to believe in a single apparition or miracle, Its up to you to decide.
From the time of Adam, God has spoken to His people through visions, dreams, and inner voices.
Miraculous events are common in the worlds of the Old and New Testaments, and the lives of the people are marked by supernatural intervention. In our time, God is also grabbing ordinary people from our midst to use as His mouthpieces.
Its funny you mentioned this particular vision as it concerns St Faustina the Saint in my Signature, although I have spelt mine as FOustina as thats the way I say it in my arabic dialect. This Saint is dear to me and I know a few things concerning her.
Getting back on topic.
The earliest element of the Devotion to the Divine Mercy revealed to St. Faustina was the Image. On February 22nd, 1931 Jesus appeared to her with rays radiating from His heart and said,
Paint an image according to the pattern you see, with the signature: Jesus I trust in You. I desire that this image be venerated, first in your chapel, and throughout the world. (Diary 47)
First this is regarding Jesus not Mary, second veneration is not a sin.
By itself an image is merely a painting, no matter how beautiful and expressive. Yet, it can point us the mysteries of the faith and dispose us to grasp and receive what it represents, in this case the Divine Mercy. It is thus a vessel, not the source, a reminder, not the reality.
The reality is the merciful fountain of grace flowing from the Heart of Christ.
The image also reminds us that salvation is not just by faith, but by works of charity also.
Remember it takes faith to see and believe in what the Image signifies.
"This people honors me with their lips, but their hearts are far from me" (Is 29:13);
"Blessed are the merciful, for they shall obtain mercy" (Mt 5:7).
The Divine Mercy involves a total commitment to God as Mercy.
You quoted some parts of St Faustinas writing, here are some more.
I demand from you deeds of mercy which are to arise out of
love for me. You are to show mercy to your neighbors always
and everywhere. You must not shrink from this or try to
excuse yourself from it (Diary, 742).
Like the gospel command, "Be merciful, just as your Father
is merciful," this demand that we show mercy to our
neighbors "always and everywhere" seems impossible to
fulfill. But the Lord assures us that it is possible. "When a
soul approaches Me with trust," He explains, "I fill it with such
an abundance of graces that it cannot contain them within
itself, but radiates them to other souls" (Diary, 1074).
How do we "radiate" God's mercy to others? By our actions,
our words, and our prayers. "In these three degrees," he tells
Sister Faustina, "is contained the fullness of mercy" (Diary 742).
I honestly do not know that much concerning this vision. I love the picture though, its one of my favourite pictures of Jesus Christ.
Amen to that!