Allah loves Hazrat Muhammad SAW and everyone who wants to get close to Allah Almighty sends lots and lots of darood shareef on hazrat Muhmmad SAW every day all the time. Hazrat Owais Karni R.A, Hazrat Bilal R.A and then ashaab e suffa, tabaeen and the buzurgs after that constantly recited darood shareef to gain attention of Allah and become beloved of Allah.
Hazoor Baba Fareed R.A used to stay in constant recitation of Hazrat Muhammad SAW, the books written on Baba hazoor life and through his mureeds and other people show Baba Fareed as a divine lover of Hazrat Muhammad SAW. Not only he used to conduct mehfils of rabi ul awal but also advised and treated his own mureeds and other people through the blessings of darood shareef.
If a person calls Allah in his heart all the time and sends darood shareef on the most beloved and top most peronality in this world, then even Allah remembers that person and since hazrat Baba Fareed R.A has left this world for the next world, people havenot forgotten him and will never forget him, its been more than 700 years now. Most people here wouldnt even know about their own ancestory a 100 years ago, but the humanity is celebrating and remembering Baba Fareed R.A. Allah is true to His word in Surah Baqarah , ayat 152, Allah remembers his loved ones like dervishes like Baba fareed R.A.
Hazrat Muhammad SAW is an ashiq of Allah and mehboob of Allah's followers. There are wazaif of darood shareef whose recitation invites Hazrat Muhammad SAW to come in dreams of ordinary muslims, and if its an ashiq of Hazrat Muhammad SAW , an ashiq like Hazrat Baba Fareed RA who kept the name of Allah and recitation of darood shareef throughout his life, then hazrat Muhammad SAW gracing his presence at Hazrat Baba fareed RA shrine is no surprise. Allah and His beloved prophet never ever let their ashiq down. Anyways, the reference of bahishti door is found in books written by buzurgs like hazrat Nizammudin Auliya R.A who followed the lines of his teacher Baba Hazoor R.A. If someone doesnt believe, who cares. As for bombing,the world can try and bomb, they will fail,Allah takes care of his divine lovers, tartars tried, changez khan tried, halaku khan tried, Mughal emperors tried, the British tried, now terrorists tried.its more than 700 years and will continue because this buzurg remembered Allah all the time and Allah is true to His word.