I think Jesus said it best, you will know them by their fruits. Look at the teachings directly attributed to Jesus, everything else is suspect. Your heart will tell you this is true, and that isn't. The same goes for all religions. They all have good things to teach us. But they all contain bad as well. You just have to filter it out. There are spiritual messages everywhere, you just have to open your eyes and see them.
When I fought against accepting my transsexuality, when I fought to suppress my true gender, I felt emotional, mental, and spiritual anguish. When I accept myself, I am contented. I think that speaks volumes.