Read up on him more. He's essentially former KGB that was originally assigned to keep an eye on the token remnants of the church in Soviet Russia. He's now saying the war against Ukraine is "holy and justified", signing up to fight is "guaranteed to wipe away your sins", etc. He's designed to manipulate a segment of the population. He's Putin's method to "religiously justify" whatever Putin wants.
The Russian Orthodox Church has been a Chekist front since Stalin revived it for nationalistic reasons during WW2. Kirill is just continuing the tradition.
