Benika's father is a true honest good priest...asking god for forgiveness and saying he will praise his name even if he sins/beyond redemption (Honestly there is nothing to forgive, he is just defending himself and his daughter in self-defense....)
Also he is pretty fking smart!!! Okay he had the clues to figure out that Rose was the same person from the confession booth....but to figure out why he was being targeted...he managed to figure out it was the Rosary (Since clue 1 Rose warned him about his life being target and clue 2 he did nothing to gain attention except meeting the Arch-priest/bishop and getting the Rosary...lol his comment about the Arch-bishop giving him a item many people willing to kill him for it XD)
The way he gauge the other 2 reaction from the fake out Rosary (He pull out key-chains) to look for SUS behavior [Shame on those 2 for not being able to control their expression...good job Father Shirafune!!]
The way he assumed these 2 must be extremely skill hitmen on Rose's level (...not really but close enough), Quality vs quantity stuff.
Him confirming he was the same priest she(Rose) was confessing to and giving her the keyword (there is always a path to forgiveness)
Throwing the rosary to Rose for distraction and going for the backstab while their attention is on Rose+Rosary...lots of guts...too bad he is just a normal priest without combat training and Gina(Sung) stopped it with a fork which isn't surprising since she is skilled.
For a normal person...they would probably just think to just give the Rosary to prevent and avoid any fighting/killing from those 2 random hitmen (Church and hitmen group but Father Shirafune doesn't know that yet, probably thinks they on same side.) but technically Father Shirafune's action is actually THE CORRECT CHOICE!!
Since if he just gave the rosary and they left....Benika still has the [Bomb-cross] on her neck/person....so the Arch-bishop would just kill his daughter + him in an attempt to kill Rose after they leave....Now that Rose has the Rosary the Arch-Bishop cannot explode the [Cross-Bomb] without destroying the Rosary containing all that juicy blackmail info/intel!!!
Also...Hibai & Gina(Sung) is teaming up to hold Benika's father hostage even though they on opposite sides lol...even though I dislike their actions I kind of ship the last picture lol....they teaming up to take on Rose....(Church +Hitmen group/Babylon union)