So a guy I play with on a regular basis has this extremely cheasy Witch Hunter armylist.
There are 4 normal squads in rhinos with sister superior and a lot of gear! all stuff that means hes got another flamer there, martyrdom, and things that means he never ever fails a test of faith.

He also got a land raider full of grey knight teminators who rape where ever they go, a "super-nun" with jump pack, along with some more jump packers, and an exorcist.

The army starts out with around 7 faith points, but it can NEVER run out because when finally kill something he gets a point and he can use them all the time to shoot my marines with ap 1 and when I hit him with something he has invl 3+.

The only army that I have seen ever to do well against this was an IG list with a lot of lasguns. the quantity of the fire power made his faith points wothless but I can't really do the same with space wolves.
I tried sniping the superiors with jaws of the world wolf but a psyhood ruined it.

So what do I do?