You are wrong.
The concept of original sin doesn't mean that man is inherently evil.
In Catholicism it means mankind is weakened. I've explained that already. Catholics DO NOT believe the inherent nature of man is evil. Some Protestants do and obviously some of these Protestant Evangelicals believe that.
Most Catholic dogma comes from Catechism and not the bible.
The Catechism of the Catholic Church says:
By his sin Adam, as the first man, lost the original holiness and justice he had received from God, not only for himself but for all human beings.
Adam and Eve transmitted to their descendants human nature wounded by their own first sin and hence deprived of original holiness and justice; this deprivation is called "original sin".
As a result of original sin, human nature is weakened in its powers, subject to ignorance, suffering and the domination of death, and inclined to sin (this inclination is called "concupiscence").
Catechism of the Catholic Church, 416-418
How do Catholics define concupiscence?....
http://en.wikipedia.org/wiki/Concupiscence The primary difference between Catholic and Protestant theology on the issue of concupiscence is that Protestants consider concupiscence to be sinful, whereas Catholics believe it to be highly likely to cause sin, though not sinful in itself.
This difference is intimately tied with the different traditions on original sin. Protestantism holds that the original prelapsarian nature of humanity was an innate tendency to good; the special relationship Adam and Eve enjoyed with God was due not to some supernatural gift, but to their own natures. Hence, in the Protestant view, the Fall was not the destruction of a supernatural gift, leaving humanity's nature to work unimpeded, but rather the corruption of that nature itself. Since the present nature of humans is corrupted from their original nature, it follows that it is not good, but rather evil (although some good may still remain). Thus, in the Protestant view, concupiscence is evil in itself.
Catholicism, by contrast, teaches that humanity's original nature contained an innate tendency to sin. Due to a special supernatural gift granted by God to Adam and Eve, namely original righteousness, they were able to overcome their tendency toward evil and fully orient themselves towards God. After the Fall this gift was lost and the natural self ruled; because the natural self was not fully oriented toward God, the result was sin. But, in the Catholic view, human nature cannot be called evil, because it is natural; despite the fact that sin usually results, Catholic theology teaches that human nature itself is not the cause of sin, although once it comes into contact with sin it may produce more sin, just as a flammable substance may be easily ignited by a fire.
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