Here's something to think about:
Hebrews 5:11:-6:3
"We have much to say about this, but it is hard to explain because you are slow to learn. In fact, though by this time you ought to be teachers, you need someone to teach you the elementary truths of God's word all over again. You need milk, not solid food! Anyone who lives on milk, being still an infant, is not acquainted with the teaching about righteousness. But solid food is for the mature, who by constant use have trained themselves to distinguish good from evil.
Therefore let us leave the elementary teachings about Christ and go on to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God, instruction about baptisms, the laying on of hands, the resurrection of the dead, and eternal judgment. And God permitting, we will do so."
The Hebrews by this time were not recent converts. The author of Hebrews is saying "C'mon guys! Time to learn more and dig deeper into the Word!" This article written by Andrew Webb probably should not have been posted without the clarification that its intended audience is not for 'sinners and pagans', but it is for those who are already born-again Evangelicals and who are seeking to gain more discernment about theological matters. Protestants and Catholics believe different things about Salvation. He's pointing out to his fellow Protestant Evangelicals those differences. If it were a movie such as the "Jesus Film" I am certain Catholic theologians would have issues with it that they would like to point out to their fellow Catholics.