So what in the world does the Catholic perversions of the gospel have to do with worshipping God in Spirit and Truth?

Anyone who is so spiritually blind that they cannot see the fulfillment of bible prophecy (Mystery Babylon the Great, Mother of Harlots), is probably never going to see just how badly they've been had.

Satan has done a MASTERFUL job at getting them to throw the baby out with the bathwater. (throwing Jesus out with the Satanic lies and perversions of the truth)