(this is different, but related to the religious movement Pietism, related to Methodism)
I previously wrote on the tension between Legalism and Antimonialism.
There is a similar tension between Pietism and Antimonialism.
The pietist looks for outward signs of conversion (2 Cor 5:17; Eph 4:24; Col 3:10; Rom 6).
Piety is a good thing. As Christians (new men) we should show the effects of this new-ness. We should strive to be good examples (ambassadors) of our Lord (Col 3:17).
There should be something in our daily living which leads people to ask "the reason for the hope in us" (1 Peter 3:15).
Similarly, a nation of Christians should show it. The "Protestant Work Ethic" should be more than tradition or a drive to get more for ourselves. It should be driven by theology.