Yes, you are protesting against the Catechism of the Catholic church - YOUR church. There have been many popes after Pious X and they were placed there by the SAME process that Pious X and those before him were. Who are you to reject the Popes of your religion? Do you have such authority? Do you have magisterial permission to lead others to do the same?
And only Pope St Pius X is a canonized pope of the twentieth century (I'm not including "saints" canonized after JP II did away with the devil's advocate.)