Where did you get the 1700's being when the Catholic Church was formed? I don't think you'll find a fellow atheist who has completed Jr. High World History will join you on that. The major tenant of Christians is original sin (and continued sinners after conversion)- there is no claiming of purity of soul.

 I think you are a self-created messenger who has not studied World History, American Government or Comparative Religions at the Jr. High or High school level- I say that as a former 7-12 grade social studies teacher.