He had carefully compared the teachings of many different religions, even non - Christian religions, with what the Bible says.
فَقَارَنَ بَيْنَ تَعَالِيمِ ٱلْكِتَابِ ٱلْمُقَدَّسِ وَتَعَالِيمِ ٱلْكَثِيرِ مِنَ ٱلْأَدْيَانِ ٱلْمَسِيحِيَّةِ وَغَيْرِ ٱلْمَسِيحِيَّةِ .‏