in other words, he used the tax laws that exist to avoid paying? I think that is good that he knows how to manage his money effectively.
The thing wrong is the tax laws/codes. Change those.
English Standard Version (ESV)
8 For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast. 10 For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.