On Jordan's personal channel (Jordan Taylor), he does a video in which a few people ask if he is a Christian, in which he also talks about how most of his videos are in a joking way (the title of the video is "Jordan Reacts to Youtube Comments"). He receives a question asking if he is a Christian or an atheist/agnostic, to which he responds that he is not an atheist, and light-heartedly chuckles as he wonders why everyone thinks this after all this time.
Like Gloria said, they mostly discuss their faith in their videos, especially with most of their videos focusing on Christians (often in a satirical way, so as to get the message across) and homeschoolers, as they were homeschooled themselves. In addition, he often collabs with other Christian Youtubers.
All of that being said, no one really knows another person's heart, so I can't say for certain, but most of the evidence leads to his being a Christian. The best way to find out though is to check out his videos. Hope that helps.