I recently watched the movie, "American Gospel; Christ Alone". It was so clear and helpful to understand the true Gospel (not the American Gospel but what the true Gospel actually is) and to understand who is a false teacher and why. I recommend checking it out! It costs to see the full documentary on Vimeo (but is totally worth it and pays for the hard work of the people who put it together), but you can see the Gospel part of it and some extras for FREE on YouTube. Again, it's called "American Gospel Christ Alone". I think you'd appreciate it too!