No. The biggest challenge is overcoming the tricks of Satan and finding your way to the narrow path to heaven.
Read http://october-5-2017.com#welcome
or watch video
https://www.youtube.com/watch?v=jnpbCZ9c-pQ
Yes. I was intending to post merely, "Our biggest challenge is sin," which also includes our inborn predilections. The combination of our sin and "Satan's tricks" is unconquerable by man--we need Christ's work in our stead.