No particular denomination comes to mind. Yet I feel there are some tests. Do you believe in one God in three persons? Do you believe the only way to achieve salvation is via Christ, Do you believe the bible is the inherent word of God? Do you believe salvation is by faith through grace alone? If you say yes to these core principles I will call you brother and we can have an absolute blast debating the other points in our theology. The catholics fail on one of these major points and also introduce worship to other deities. So I will challenge that they are truly Christian. These reasons and many more is why the reformation came about.