It is safe to assume then that whoever seeks God has been called out by God...All church attending Catholics then are closet Calvinists...
You're suggesting that all who attend church are seeking God, and that is not necessarily true. Churches are full of unregenerate attendees and members, who are seeking after their own righteousness. Churches are also populated by saved people who, instead of being teachers, (Hebrews 5:12) ...need someone to teach you the elementary truths of God's word all over again..."
It is amazing the ignorance of the modern church.