BTW---the official church does not teach that humanity is "continually in a state of sin."  I suggest that you examine your own understanding of the teachings of the Church.  
Secondly, you need to understand that the "qualifications" [if I can call it that] for Mortal Sin was set extremely high by the church.  It is extremely hard [one really has to try] to commit a mortal sin.  This was done for good reason.
Do you believe that people who eat/ate meat on Friday are in the same category of Mortal Sinners as those who coldly calculate Mass murder and commit it?  Do you believe that people actually choose to commit sin OR do they act on the spur of the moment---because of the situation---and don't think it through?  People can sin, yes, but constantly commit Mortal Sin? NO!  

I am Very Catholic.  I attend Mass daily and receive Communion.  I also regularly receive the Sacrament of Reconciliation.  And I am a verified teacher within the Church.  But I don't believe in what you're saying