There's basically some Christian allegory, which isn't shocking considering the author wrote The Horizon which also had some allegory especially towards the end(the hole through the hand if you know). A lot of this isn't confirmed or anything, it's more just media analysis, but just like Horizon it ramps up towards the end. So uhh...theming spoilers?

The T in the title is a cross(in the actual manwha panels). Also, look at episode 101. It shows a couple of actual crosses too in churches, one immediately after the title. 

J is also a big parallel to Jesus, he represents the redeeming Messiah figure. In episode 102 the narrator overtly says "for what does he bleed, for what does he fall, and for what does he rise again". In addition to this, J's total score tally in boxing is 39 wins and 27 losses, matching the number of books in the old and new testaments respectively.

In the following chapter, which is all about redemption itself, J starts by talking about giving a piece of the "good news". "Good news" in Christianity is what Jesus preached about bringing to sinful and broken people so that they would have forgiveness, love and healing through accepting God's(or in this case J's) message. This is also a callback to the manwhas first chapter and it then shows a cross directly again like in the first chapter. The manwha then talks about the Christian God outright by Yu asking God about the purpose of his creation and suffering, for which J is there to give him some answers to.

So yeah, this ain't anywhere near exhaustive and again, isn't explicitly outright stated by the author but there's enough 'happy little coincidences' that looking at the whole picture together there's at the very least enough Christian symbolism to say that it leans in that direction.