People naturally have a sense of right and wrong, and even want to do what is right. But we are born into a world corrupted by sin and have bodies that have also been corrupted by sin.
Yet people often do a lot of good deeds in spite of this and in spite of being trapped in a false religion.
One of the most difficult things for anyone is to question and overcome the false beliefs into which they were born. This includes false Christianity.
And, it is possible to practice false religion even when surrounded by the truth. The most dangerous place to be may be in the presence of true religion, faith, and spirituality.
For example, the Devil was, we believe, in the very presence of God before he fell. And Judas walked with Christ for years before betraying Him.
Be happy that articles such as this have been published. The truth needs to be told.
I think in the Bible, in the OT Book of Issiah there is a chapter about a fallen angel.