Because Roman Catholicism is a counterfeit of Christianity - always has been, always will be. The Jesuits are Satan's soldiers. Catholic laiety is largely ignorant. They just do as the priests tell them.
Roman Catholicism will unite with Islam and become the New World Order's official religion that will spawn The Antichrist. If this is what Trump is leading the USA into, then America is lost. They will have believed the lie, the great delusion that will preced the return of Jesus Christ in all His glory.