Salam To Non-Muslims
You can read the following Facebook post by Dr. Shehzad Saleem which explains these points in English: https://web.facebook.com/javedahmadghamidi/posts/saying-al-salam-u-alaykum-to-the-non-muslimssome-muslim-scholars-hold-that-non-m/889620074415278/?_rdc=1&_rdr#