No, it's not like Rosemary's Baby At All. That's the point.

Rating: 8/10 (3 October 2017)

*Spoilers ahead*
I'm seeing a lot of people say that this film is a rip-off of Rosemary's Baby.
They couldn't be more wrong. However, any similarities or allusions are clearly there to point out stark polar opposites.
In Rosemary's Baby, she is raped by an other world demon and MAYBE her husband. A depiction of physical rape.
In Mother! she is "raped" by her own husband taking her love for granted. She is also "raped" by the consequences of her own passive aggression. A depiction of emotional rape.
In Rosemary's Baby, she is impregnated with the spawn of Satan.
In Mother! she is essentially impregnated with a child of "God", given the clear contextual metaphor of Cain and Abel.
In Rosemary's Baby, the baby is destined to be a sacrifice.
In Mother! The baby is laid on the altar as a response to its demise and accidental death. This is CLEAR because the entire crowd in the house gasps in shock when the infant is killed. Intentions evolve as the father surrenders his will to the people by handing over his son.
In Rosemary's Baby, the husband doesn't have mommy issues. In Mother! the husband definitely has mommy issues, which is the reason he does everything he does.
He craves love and gives none in return. He is willing to compromise his own lifeblood if he knows it will make people happy. While he doesn't intend to sacrifice the infant, he doesn't take danger into account because of his unhealthy lust for approval.
Multiple times, the cinematographic work emphasizes the sincere momentary grief the husband has when his own child and wife are harmed. This is much different than the idea that he intentionally harmed either one of them from the beginning (which would be more along the lines of Rosemary's Baby)
See? It's polar opposites.
The metaphors are not convoluted. They all aid in expressing an inverse universe of Rosemary's Baby, and the writer did a great job of drawing out motivations as to how it all happens.