Well, when you study the 3 Abrahamic Religions you will discover that The Quran is the Word of GOD but without the Hadith. Then GOD chose the Jews as their Priest Folk and made a convenant with them, it was sealed by the mosaic laws, the Torah.
When Yeshua was here, HE breaks down the Torah and said. The first and greatest commandment is to love GOD with all of your Heart. And the second is like this "Love your neighbor as yourself". These teachings were for the gentiles that they may find the way to GOD. Out of this Christianity was established...
But you are right, that the authorities of this World corrupted the teachings for their own despicable lusts, as I tried to explain to you the comment before...
... but better you hear Christ explaining it himself: