The following words were revealed by God to St. Hildegard von Bingen (taken from her ‘Scivias’):

29. Why God made Man such that he could sin

“Therefore listen and understand Me, you who say in your hearts, “What are these things and why?” Oh, why are you so foolish in your hearts, you who have been made in the image and likeness of God? How can such great glory and honor, which is given to you, exist without testing, as if it were an empty case of nothing? Gold must be tested in the fire, and precious stones, to smooth them, must be polished, and all things of this kind must be diligently scrutinized. Hence, O foolish humans, how can that which was made in the image and likeness of God exist without testing? For Man must be examined more than any other creature, and therefore he must be tested through every other creature. How?
 Spirit is to be tested by spirit, flesh by flesh, earth by water, fire by cold, fight by resistance, good by evil, beauty by deformity, poverty by riches, sweetness by bitterness, health by sickness, long by short, hard by soft, height by depth, light by darkness, life by death, Paradise by punishments, the Heavenly Kingdom by Gehenna, earthly things by earthly things and heavenly things by heavenly things. Hence Man is tested by every creature, in Paradise, on earth and in Hell; and then he is placed in Heaven. You see clearly only a few things among many that are hidden from your eyes. So why do you deride what is right, plain and just, and good among all good things in the sight of God? Why do you think these things unjust? God is just, but the human race is unjust in transgressing God’s precepts when it claims to be wiser than God.

30. Man should not examine the highest things since he cannot the lowest ones

Now tell me, O human: What do you think you were when you were not yet in soul and body? Truly you do not know how you were created. But now, O human, you wish to investigate Heaven and earth, and to judge of their justice in God’s disposition, and to know the highest things though you are not able to examine the lowest; for you do not know how you live in the body, or how you may be divested of the body. He Who created you in the first human foresaw all these things; but that same most gentle Father sent His Only-Begotten to die for the people, to deliver humanity from the power of the Devil.”

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Some Further Revelations Given to St. Hildegard

An Admonishment (one that is very relevant for our times)

“A man who sins with another man as if with a woman sins bitterly against God and against the union with which God united male and female… And men who touch their own genital organ and emit their semen seriously imperil their souls, for they excite themselves to distraction; they appear to Me as impure animals devouring their own whelps, for they wickedly produce their semen only for abusive pollution.”

Instruction on Spiritual Reading

“But now the Catholic faith wavers among the nations and the Gospel limps among the people; and the mighty books in which the excelling doctors had summed up knowledge with great care go unread from shameful apathy, and the food of life, which is the divine Scriptures, cools to tepidity.”

How to Remain Chaste

“When a person feels himself disturbed by bodily stimulation, let him run to the refuge of continence, and seize the shield of chastity, and thus defend himself from uncleanness. How? Let him cast out the tares from the wheat, which is to say, let him separate the clamor of lust from the sweetness of chastity. And whoever thus casts out of himself the taste for lust is very sweet and lovable to Me.”

The Delights of Paradise

“But Paradise is the place of delight, which blooms with the freshness of flowers and grass and the charms of spices, full of fine odors and dowered with the joy of blessed souls, giving invigorating moisture to the dry ground; it supplies strong force to the earth, as the soul gives strength to the body, for Paradise is not darkened by shadow or the perdition of sinners.”

https://littlestsouls.wordpress.com/2015/09/29/why-did-god-make-us-knowing-that-we-would-sin/

Why did God make us, knowing that we would sin?

So that we could please Him by trying not to sin, and by having contrition when we do.

Why did God make us, knowing that we would sin?

Is quite simple. The universe exists for one reason, to manifest the Goodness of God to the farthest possible extent.

In order for His Goodness to be manifest completely there must be mercy and justice, for if all were born in Heaven then no one could know the justice of God (punishment for evil), just as His mercy could never be know if all were left in the state of Original sin.

It is not about US, but rather about HIM!