So it may not be Rosemary and it may not be at all really connected, especially this going full gore. But there are some similarities and the inciting incidents is one of them. I did have an issue with how that was handled in the Polanski movie, this one does a "neat" trick by jumping forward timewise, so we don't really see how this is handled after the fact.
Now you may like that or hate it, but it is what it is. When you get over that, you get quite the tense story and quite the explicitly shown violence on screen. The effects may have looked better to the viewers back then (didn't really survive the test of time entirely), but they still are something to be amazed by. If you can remember the time they were made and everything they had in their power to do them. No CGI obviously and the story is predictable to say the least ... it is the horror aspect that will either get you or leave you cold
Now you may like that or hate it, but it is what it is. When you get over that, you get quite the tense story and quite the explicitly shown violence on screen. The effects may have looked better to the viewers back then (didn't really survive the test of time entirely), but they still are something to be amazed by. If you can remember the time they were made and everything they had in their power to do them. No CGI obviously and the story is predictable to say the least ... it is the horror aspect that will either get you or leave you cold