Islam is a way of life. There is no difference in the Religion and World way of living. If you are a Muslim your every step is according to the teachings of Islam. If Muslims are practicing anything in a whole (Ijma) it will not be stop because of a small group getting hurt. And the day of our beloved prophet Hazrat Muhammad Sallalaho Alaihe Wassalam is being in practice since more then 1000 years, and the people who started making comments on this occasion are not in the history before 1924. If it is not like this please show me any reference that from which time the comments against this day are being given. Secondly before Islam cheating in business was a practice and it was a business technique, and up till today non Muslims use the cheating as a business technique, but Islam stops it, now business is a part of world or religion? Same is the situation in taking abolition, in a non Muslim society there is no concept of water in public toilets, and Muslims there specially arrange water for themselves to take abolition. The abolition is necessary for Salat (Namaz). But there are Muslims who does not perform Salat but there habit of abolition is according to Islam. Why? These are the signs of Muslims, the signs which Muslims practice as a whole and the signs from which a Muslim is easily distinguish from a non Muslim. 


Brother knowledge is in the books,especially when we want to take a decision of something right or wrong, we refer the books and the reference books which are written by our most big Scholars of the time of Islam when it was mostly in the hands of good people according to our beloved prophet Hazrat Muhammad Sallalaho Alaihe Wassalam that the best time of Islam is mine, then the time of people left behind me (Hazraat Sahaba) then the time of people after them (Tabaeen). Most of the Islamic work was completed in their times, the work in Aqaid, the work in Fiqh and the work in Tareeqat has also been in the form that Muslims can easily follow. However big scholar is Dr.Israr but he has no value in front of those people which are mentioned by our beloved prophet Hazrat Muhammad Sallalaho Alaihe Wassalam.
The books are available now written in Arabic and Persian with newly printed, and also translation is also done in Urdu is also available for many books.
Secondly to proof anything wrong or right we cannot put a man in front of us that because he is telling us or he is doing this, it is right for us to follow that person. 
The rule to follow a person is only with our beloved prophet Hazrat Muhammad Sallalaho Alaihe Wassalam. Secondly then with Sahaba with some conditions applied on them also. So dear in today's world if you want to be on a righteous path please ask them about the reference of books from which they are quoting their words.
I can give you many references of Youtube of todays Scholars who has done speeches in the positive approach of practicing 12 rabiulAwwal. for Tahirul Qadri. But these scholars are not the symbols or sign of or can do any help to Islam in the world of references. Are you 100% sure that Imam Abu Hanifa was against 12 RabiulAwwal. Do you know the name of any Sahabi which has literally told us or command us that do not celebrate the day of our beloved Prophet Hazrat Muhammad Sallalaho Alaihe Wassalam. Mention any one Tabai who has literally told us or command us that do not celebrate the day of our beloved Prophet Hazrat Muhammad Sallalaho Alaihe Wassalam.
They all were use to celebrate the day of our beloved Prophet Hazrat Muhammad Sallalaho Alaihe Wassalam in their own way, by fasting or by feeding the needy ones or by practicing extra Salat. With the time, people used to light their house with oil lamps and used to get together and say Naat of our beloved prophet Hazrat Muhammad Sallalaho Alaihe Wassalam, today we have added electric lights and also Mehfile Milad is performed as usual and people come on street showing their love and use to help poor and other people who are in need and in the next 100 year the form will be changed from today's idea of celebrating Eid Milad un Nabi.  


Now I will ask some questions to you, If you are agreed with the concept that Islam is a way of life. It is for every time. Then try to answer these questions. Or take help with the scholar you mention in your in your post, or any other helpful scholar you get in Hand.Why you use internet? Why you watch T.V? Why you use cell phone? Why you use to travel in Aeroplane? Why today the Islamic Army is making Tanks and War Aircrafts to fight with Enemy? Why they use bombs? Why you are using the ball pen, the pencil the keyboard to share knowledge? Why you use to make movie? Why you are taking pictures? Just keeping in mind that in Islam there is no difference in the world and religion.
If you are 100% agreed with this statement then try to answer these above questions. Otherwise proof me that in Islam both the things world and religion are practiced in different ways. Hope you will reply soon and your answer will help us all to come to a conclusion.