I reply to my downvoter, I say: the only thing worse than not knowing what the Church is, is hearing what it is and rejecting it.
Given that the Catholic Church has been occupied by Modernist heretics (Modernism is a heresy) for 60+ years, it's difficult to know where the Church is exactly.
Is the Church as it exists in Rome the true Church? I think that it is, though given that the Modernists have changed so many things about the Catholic faith, it often isn't recognizable as having the Catholic Faith. If there were no modernist Crisis, we wouldn't have to debate the issue.
Bp. Tissier de Mallerais once wrote a study of this situation. He wrote that the occupation of the Church by Modernists is like a parasite that feeds off of a host. The Modernist parasite is not the Catholic Church, but it can only exist by feeding off of the True Church, and in this sense it does still retain or absorb some of the Catholic Faith. So in effect, there are two churches in one body. Just his opinion, but it makes some sense to me.