On a minute -by-minute basis, a secular jew commits one sin after another. Every time he eats, lives in rooms without mezuzos, every day without tefilin/shma/davening, every shabbls desecrated, every marrital relation an issur kares, every wall in the street full of forbidden gazes
A sin is an action, thought or speech against halacha. Or is it just stealing and cheating on taxes?