(((safe hugs)))

Nowhere in the definition of rape or abuse/neglect is the term "non resistance" included. Resistance is a non issue regarding a such a definition.

Resistance or not: that belongs under doing what is necessary to survive, whether conscious thought or not.

This issue is often raised when someone is trying to come to grips with blame or shame, imo: the core issue.
When something is done to a child that is harmful, it doesn't matter whether the child did anything wrong, or resisted or not etc., it is abuse. Harm comes in the forms of sexual, emotional, physical abuse, and also neglect. (Even not buckling a child in a car, with a seatbelt, is neglect.)

No child has the understanding nor the capability to counter someone who has rule over them, is bigger than they are, or has them intimidated. No child. And, to me, you are a child until you're 21.