Apostle Paul wrote, "for all have sinned and fallen short of the glory of God" (Rom. 3:23) Jesus said, "Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God." (Jn.3:3) Often times evangelists will be accused of heresy for simply preaching repentance, and they will be lumped into the Pelagian school of thought.
Pelagianism is a heretical theological position that holds that the original sin did not taint human nature and that humans have the free will to achieve human perfection without divine grace.
Those that don't like the idea of original sin will often quote Romans 5:19 which says "many were made sinners" but not all. If one reads 12 through 21 it is clear that the transgression of one (Adam) sin reigned in death until the time of Jesus who came to deliver us. There are extreme views on both sides of this issue and they will cherry pick their favorite verses to justify their argument. Without question sin has a spillover affect on all of society and eventually the grace of God is pushed to the limits as in the case of Sodom. Even children were destroyed along with the adults. We see the same thing with Noah and his family being saved while the whole of humanity perished. Some will want to know if the sin is inherited through blood or DNA. Trying to explain spiritual matters such as sin in terms of science is like trying to put God under a microscope. However the reaping and sowing principles are quite easily observed. We won't be able to blame the Devil when in fact it is our own darn fault.
