How is this sin nature automatically passed down from Adam, by birth? And if this is the case, why is God so concerned about our sin if it comes naturally? Why did God allow us to choose? How was God created? What does it mean in 1 John 3:9, that we cannot sin as believers? Is once saved always saved biblical?

Tags: 1 John 3:9, free will, how was God created, once saved always saved, sin, sin nature