Do You Understand the 'Simplicity that is in Christ'?

In 1 Corinthians 11:3, the Apostle Paul mentioned the 'simplicity that is in Christ,' but warned that people could be deceived away from it. Do you know what that simplicity is? Is it simply to "believe" and not even pray as Protestant David Stewart asserted? Are we saved by grace for good works? Are Christians supposed to obey? Did Jesus and the Apostle Paul tie obedience in with salvation? What are Christians supposed to obey? Can false ministers look good? …