The claim Charlie Kirk did not follow his faith cannot be proved nor disproved. This claim is a feeling/opinion on how a man carried himself through his beliefs.
A source I found is very similar to the source provide in the original claim. It is about how some black pastors and christians don't feel like Charlie spread the word of the Lord but instead hate. This goes along with the original claim, however non of this is can be factual proven on how he felt through his beliefs.
https://www.christianitytoday.com/2025/09/black-clergy-and-christians-grapple-with-charlie-kirks-legacy/
The bias on the source provide, is that there is a chance that the author of the source did not like Charlie Kirk and what he stood for. Having this bias can complete sway the tone of the article.
Evidence supporting the original claim are past sayings and quotes from Charlie Kirk. Charlie Kirk has said things in the past that are non-christian like, leaving the sense that he did not follow his faith.
Evidence undermining the claim is Charlie Kirk's constant preaching the bible and following the Lord's teachings, through his politics he would try and relate everything back to his faith.