I have a lot of fundamental problems with Catholicism, but if I listed them and gave refutation of them, I suspect I would be flamed and banned.
Ultimately we are charged with working out our own salvation with fear and trembling. When you stand before God you will not have the excuse that Pope so-and-so said that what you did or what you believed was ok.
If you have problems with Catholicism that you can't discuss with charity and kindness toward your neighbors, including your Catholic neighbors, then you need to forget about them and work on your relationship with God. IMO.
Ultimately we are charged with working out our own salvation with fear and trembling.
We are also charged to obey the leaders God has placed over us; Hebrews 13:17.