Believers & Non Believers According to the Gospel of the Reformation: Difference?

How do you tell real Christians from fake ones? The modern "Christian" church is filled with heretics of all kinds running the full spectrum from legalism to antinomianism. Jesus Himself said few would be saved (Matthew 7:13-29) so how is a true Christian to discern these things? Larry Wessels, director of Christian Answers of Austin, Texas (YouTube channel: CANSWERSTV, see our playlist "Dealing with Roman Catholicism, Idolatry & the Virgin Mary" at http://www.youtube.com/playlist?list=PLFFA8D69D1B914715&feature=plcp; websites http://www.BIBLEQUERY.ORG, http://www.HISTORYCART.COM & http://www.MUSLIMHOPE.COM) presents the featured guest speaker, former Roman Catholic William Webster. Mr. Webster is author of the books, "The Church of Rome at the Bar of History," "The Christian: Following Christ as Lord," "Salvation, The Bible, & Roman Catholicism" & various articles including "Why Scripture & the Facts of History Compel Me, A Former Roman Catholic, to Remain a Committed Evangelical Protestant - A Response to Francis Beckwith's 'Return to Rome.'" Mr. Webster is founder & director of CHRISTIAN RESOURCES (website: http://www.CHRISTIANTRUTH.COM).

Theologian Huldrych Zwingli said, "True religion, or piety, is that which clings to the one and only God. Those, therefore, who are pious listen to their one Lord, who so tears them away from the flesh and unites them to Himself that they desire to hear His voice only ... it is sacrilegious to add anything to the words of God or to take anything away. Thus again it will be manifest that only that is uncontaminated piety which rests upon the words of God solely and alone. In Matt. 15:9 Christ quotes the testimony of Isaiah 29:13.