I would think the concept of “free will” would apply to both libertarianism and Christianity.
PS: Wallis is a creepy TV preacher who wouldn’t know true Christianity if lightning hit him.
But libertarianism only affects this life. If you have consequences here due to your choices, the worst that can happen to you is death.
However, if you make the wrong choices WRT God, you’re choosing to spend eternity outside of his presence.