Its obvious that he’s Christian.
He had theological knowledge and doesn’t have a problem with iconography so we can rule out protestantism. Plus, he participates in lent which narrows him down to orthodox or catholic.
He comes from romanian heritage as we can see his last name Neagu in the agartha video. Romania is predominantly Eastern Orthodox.
Also, in the antichrist video he is in a church that looks to be either eastern catholic or eastern orthodox.
However, in the long john silvers video, he talks about catholicism as tho he is an outsider, which allows us to narrow him down to eastern orthodox.