religious authenticity

وَقَالُوا۟ كُونُوا۟ هُودًا أَوْ نَصَـٰرَىٰ تَهْتَدُوا۟ ۗ قُلْ بَلْ مِلَّةَ إِبْرَٰهِـۧمَ حَنِيفًا ۖ وَمَا كَانَ مِنَ ٱلْمُشْرِكِينَ

They say, "Be Jews or Christians [so] you will be guided." Say, "Rather, [we follow] the religion of Abraham, inclining toward truth, and he was not of the polytheists."