For me, when I got saved in 1973 at age 19, the internal difference that was manifested in my outward actions was so glaring it was hard for me (and others) to not help but notice. But, I did struggle a bit.
Why?
Born That The Works Of God Should Be Made Manifest
If man can whitewash away sin from the existence of man’s personal responsibility before God, then why, pray tell, did Yeshua have to come? If man has no sin, he’s in no need of salvation. If man is in no need of salvation then there’s no need for a Saviour. And, if there’s no need of a Saviour then what is the big deal about Jesus? Why did He come? Why did He die? Why did He rise again?