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Here is the quote from the Vatican letter regarding pastoral practice towards homosexuals:

``Although the particular inclination of the homosexual person is not a sin, it is a more or less strong tendency ordered toward an intrinsic moral evil; and thus the inclination itself must be seen as an objective disorder. Therefore special concern and pastoral attention should be directed toward those who have this condition, lest they be led to believe that the living out of this orientation in homosexual activity is a morally acceptable option. It is not''.
``As in every moral disorder, homosexual activity prevents one's own fulfillment and happiness by acting contrary to the creative wisdom of God. The Church, in rejecting erroneous opinions regarding homosexuality, does not limit but rather defends personal freedom and dignity realistically and authentically understood''.

You really should read the Catechism to dispel the fog of confusion in which you appear to operate.

Chastity and homosexuality

2357 Homosexuality refers to relations between men or between women who experience an exclusive or predominant sexual attraction toward persons of the same sex. It has taken a great variety of forms through the centuries and in different cultures. Its psychological genesis remains largely unexplained. Basing itself on Sacred Scripture, which presents homosexual acts as acts of grave depravity,141 tradition has always declared that "homosexual acts are intrinsically disordered."142 They are contrary to the natural law. They close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstances can they be approved.

2358 The number of men and women who have deep-seated homosexual tendencies is not negligible. This inclination, which is objectively disordered, constitutes for most of them a trial. They must be accepted with respect, compassion, and sensitivity. Every sign of unjust discrimination in their regard should be avoided. These persons are called to fulfill God's will in their lives and, if they are Christians, to unite to the sacrifice of the Lord's Cross the difficulties they may encounter from their condition.

2359 Homosexual persons are called to chastity. By the virtues of self-mastery that teach them inner freedom, at times by the support of disinterested friendship, by prayer and sacramental grace, they can and should gradually and resolutely approach Christian perfection.

The INCLINATION IS DISORDERED.

I would add to this that we do not know what "causes" this inclination. There are many things that might contribute. For instance a disorderly relation with one or both parents and sexual abuse, which seem more likely than an supposed "genetic" cause. Even the more likely genetic causes are suspect. If a boy is effeminate, he is more likely to be treated like a girl and to think like one than a "normal" boy.