When the RCC returns to God through faith in Christ, it might have an opportunity to lead more believers. Until that time, while many members of the RCC are also members of the Catholic Church, the RCC falls short of the Catholic Church.
You are Peter and upon this rock I will build My Church, and the Gates of Hell will never prevail against it.
While it is true that some Catholics have left Christ, the Church has never deviated one iota.