Corrected entry: When Heather shot the man with no face, in the back view you can see the device to push the blood out of the head. It's a round metal thing.
Corrected entry: The entire ending of the film, in which Claudia reveals that Heather is meant to be the vessel of the cult's dark god completely contradicts the cult's intentions from the first film. In the first film, the cult was portrayed as a a fanatical pseudo-Christian cult that tried to destroy darkness and evil by burning it. Some have argued that they are two separate cults, but this is contradicted by the film itself, which states that Claudia is the sister of Christabella (leader of the cult from the first film), and the fact that Vincent, a member of Claudia's cult, refers to it as "The Order" in one scene, which was the name of the cult in the first film. Several film critics have also noted this extreme change of continuity between the films.
Correction: It's kinda like the difference between Roman Catholic priests and Evangelical travelling preachers; both claim to practice the same religion and call themselves "Christians." Claudia and Christabella did not see eye to eye and, after her sister's death, Claudia took the cult in her own direction. It's an extremely common fantasy trope to have two rival siblings. Also, film critics in general are notorious for misunderstanding (or refusing to try to understand) films which they simply didn't like.
Correction: This round, metal device is actually part of the creature's head. You can see that the blood (which is actually digital) comes from the side of it, not the device itself, and even see the "gunshot" light up the inside. Modern squibs (which are used to simulate gunshot effects) look nothing like this "device."