A lot of kids have knives and it's not weird. My boys earned badges for using knives at Scouts. My girls do too. They ask for pocket knives. Not to practice killing people though.
They use them outside in the yard all the time. Bible study is not weird. Outdoor games, target practice and water balloons is not weird imo. Combining them is a little odd. But a lot of protestant groups add in some sort of mandatory bible study for every. single. thing. But seriously my kids have pocket knives, bb guns, bow and arrows and archery targets. I think that's just party of normal outdoorsy kids life. It's actually way WAY less violent than the common video games out there where kids actually simulate killing all the time.
Carman is just a cheesy evangelical Protestant singer who has been around for forever. I grew up Protestant as well as my did my husband so we are familiar with him. But we aren't evangelical protestant any more and haven't been for a long time so I'm not terribly familiar with what this guy has done in the most recent decades.
I just read his wiki page. What in the world makes you think "huckster"?