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but through one [m]an came sin, and death...

We do agree. To quote Suarez: "It must be held that the Blessed Virgin was redeemed by Christ, since Christ was the univeral redeemer of the whole human race, and died for all men. ... It must be absolutely and simply confessed that the Blessed Virgin sinned in Adam. ... The Blessed Virgin sinned in Adam, from whom as if from an infected root she was born by seminal generation; this is the whole reason of contracting original sin, which is from the power of conception, unless the grace of God prevenes ... It is certain that the Blessed Virgin died at least in Adam. Just as she had life in Christ, so she was slain in Adam ... The Blessed Virgin had the merit at least of death in Adam. She truly had the death of the flesh contracted from the sin of Adam ... It should be said that the Blessed Virgin was sanctified in the first instant of her conception, and preserved from original sin."

I guess what I am asking is do you believe people have the tendency to sin, are people corrupted, "sinful from the womb" as David admitted?

Well, certainly you don't expect me to deny David's words, do you? We do admit concupiscence, but we do not consider it to be properly sin:

But this holy council perceives and confesses that in the one baptized there remains concupiscence or an inclination to sin, which, since it is left for us to wrestle with, cannot injure those who do not acquiesce but resist manfully by the grace of Jesus Christ; indeed, he who shall have striven lawfully shall be crowned.
This concupiscence, which the Apostle sometimes calls sin, the holy council declares the Catholic Church has never understood to be called sin in the sense that it is truly and properly sin in those born again, but in the sense that it is of sin and inclines to sin. (Council of Trent, Session V, Decree on Original Sin)

Of the Blessed Virgin, we say (following St. Thomas, Summa Theologiae, III q. 27 a. 3) that the law of the fomes of sin, or concupiscence, was fettered but not taken away as regards the essence in her, "by reason of the abundant grace bestowed on her in her sanctification, and still more perfectly by Divine Providence preserving her sensitive soul, in a singular manner, from any inordinate movement", until she conceived Christ: "Afterwards, however, at the conception of Christ's flesh, in which for the first time immunity from sin was to be conspicuous, it is to be believed that entire freedom from the fomes redounded from the Child to the Mother" and also that by the grace of God she was preserved from every sin, mortal and venial.