In one very real sense they are. Biden, Pelosi and the like believe that they personally are the ultimate arbiter of truth. Those who reject the Church universally do the same.
Biden and Pelosi would not be likely to become Evangelicals, if they did, then it would also probably mean they were going to start being anti-abortion, anti-gay agenda voters, as it is, they are among their fellow democrat voters.
So you equate those people who violate the most basic tenets of scripture and prove with their actions that they have no love for God with many others who, by their lives, show that they have a relationship with Christ? They may not accept the Catholic Church as their authority but that does not mean that they reject God or don’t trust in Christ alone as Lord and Savior.