Help me Reddit!

I have been looking for this movie I *barely* remember from my childhood. Here is what I can recall.

• There is a very memorable scene near the end of the movie where a group of "Satanists" are each placing a blood stain/drop on a woman's forehead prior to her sacrifice. I don't think they made it to the sacrifice.
• It aired on TV in the late 70s or early 80s. I *believe* it was the movie of the week or something like that for ABC or NBC. It was right around Halloween. I remember this because I didn't want to go out trick or treating, I wanted to watch this movie. This was prior to cable TV as we know it today, so only 13 total channels.
• There is a scene where our hero and maybe the girl above (or another woman) are going up a spiral staircase. I believe the woman above was at the top (or bottom) of the stairs.

And that is all I have.

I do an October Horror Movie challenge and every year I try to find it.

Here are movies I thought it might be, but isn't it: Asylum of Satan (1972), Something Evil (1972), The Witches Mountain (1972), Mortuary (1981, 1983), Crowhaven Farm (1970), Satan's Wife (1979), This House Possessed (1981), Spectre (1977), Stranger in Our House / Summer of Fear (1978), Alison's Birthday (1981), Invitation to Hell (1984), Midnight Offerings (1981), The Watcher in the Woods (1980), The Initiation of Sarah (1978), Full Circle / The Haunting of Julia (1977/1981), Evil Heritage (1976), Black Candles (1982), Satan's School for Girls (1973), and Daughters of Satan (1972).

ANY help is appreciated! Thanks in advance.