The Quran says, follow the book. Do not follow your bloodline. Because of this, I highly assume the same thing is in the Thorat and in the Evangelium as well. 

But, I totally get your concern. Chances are that they do not care that much about their books. This is also the reason why they have changed it in the first place. 

However, a few of them, for sure can be believed to be good guys - inshallah