Challenge: Why would a good God allow people to be born with temptations to sin?
Defense: This is a subcase of the problem of evil. It is mysterious, but we can discern the outlines of the solution.
Elsewhere we have covered other aspects of the problem of evil (see Days 7, 38, and 151). Here we look at the specific question of why God allows people to be born with temptations to sin.
One way of putting the answer is: God created mankind in a state of original justice or holiness. However, when our first parents turned away from God and committed original sin, they lost this holiness and human nature was corrupted in a way that made us prone to sin (CCC 375, 379, 405).
Although the causes were on the spiritual rather than the purely physical level, the situation is similar to that of a person with a healthy genetic code who, by recklessly exposing himself to radioactive material, damages his genes in a way that causes his offspring to be born with birth defects. In other words: We are born with temptations because we inherit the damage done to human nature by sin.
Although this answers the question on one level, it leaves the question of why God would allow this to happen. Here there is an element of mystery, because God could have prevented us from inheriting temptations. However, we can say the following:
(1) God takes our inborn weaknesses into account in assessing how culpable we are. Our culpability for sin is diminished when we are under strong internal pressures. “The promptings of feelings and passions can also diminish the voluntary and free character of the offense, as can external pressures or pathological disorders” (CCC 1860).
(2) God will not allow us to be separated from Him except by a truly free choice of the kind involved in mortal sin (CCC 1037).
(3) God gives us His grace to deal with temptations (1 Cor. 10:13).
(4) God subjects Himself to our weakness. In the person of Jesus, He subjected Himself to conditions like those we experience. “For we do not have a high priest [i.e., Jesus] Who is unable to sympathize with our weaknesses, but One Who has similarly been tested in every way, yet without sin.” (Heb. 4:15, NABRE).
Love, pray for me,
Summa Catechetica, "Neque enim quaero intelligere ut credam, sed credo ut intelligam." – St Anselm, "Let your religion be less of a theory, and more of a love affair." -G.K. Chesterton, "I want a laity, not arrogant, not rash in speech, not disputatious, but men and women who know their religion, who enter into it, who know just where they stand, who know what they hold and what they do not, and who know their creed so well that they can give an account of it."- Bl John Henry Newman, Cong. Orat., "Encounter, not confrontation; attraction, not promotion; dialogue, not debate." -cf Pope Francis, “You will not see anyone who is really striving after his advancement who is not given to spiritual reading. And as to him who neglects it, the fact will soon be observed by his progress.” -St Athanasius, "To convert someone, go and take them by the hand and guide them." -St Thomas Aquinas, OP. 1 saint ruins ALL the cynicism in Hell & on Earth. “When we pray we talk to God; when we read God talks to us…All spiritual growth comes from reading and reflection.” -St Isidore of Seville, “Also in some meditations today I earnestly asked our Lord to watch over my compositions that they might do me no harm through the enmity or imprudence of any man or my own; that He would have them as His own and employ or not employ them as He should see fit. And this I believe is heard.” -GM Hopkins, SJ, "Only God knows the good that can come about by reading one good Catholic book." — St. John Bosco, "Why don't you try explaining it to them?" – cf St Peter Canisius, SJ, Doctor of the Church, Doctor of the Catechism, "Already I was coming to appreciate that often apologetics consists of offering theological eye glasses of varying prescriptions to an inquirer. Only one prescription will give him clear sight; all the others will give him at best indistinct sight. What you want him to see—some particular truth of the Faith—will remain fuzzy to him until you come across theological eye glasses that precisely compensate for his particular defect of vision." -Karl Keating, "The more perfectly we know God, the more perfectly we love Him." -St Thomas Aquinas, OP, ST, I-II,67,6 ad 3, “But always when I was without a book, my soul would at once become disturbed, and my thoughts wandered." —St. Teresa of Avila, "Let those who think I have said too little and those who think I have said too much, forgive me; and let those who think I have said just enough thank God with me." –St. Augustine, "Without good books and spiritual reading, it will be morally impossible to save our souls." —St. Alphonsus Liguori "Never read books you aren't sure about. . . even supposing that these bad books are very well written from a literary point of view. Let me ask you this: Would you drink something you knew was poisoned just because it was offered to you in a golden cup?" -St. John Bosco " To teach in order to lead others to faith is the task of every preacher and of each believer." —St. Thomas Aquinas, OP