When the deobandi scholars say its 'bida' they either don't understand fully in what way they consider it bida or they mean there is bidah done in some mawlid (like free mixing) celebrations so that's why they prohibit it
They're either using the 'laymen terminologies' (I. E. They don't bother using all the more detailed reasons why they prohibit it as it may confuse laymen, or either some of the deobandi scholars havnt learnt the nitty gritty reasons why themselves.
See my above link to bint Aisha. That explains that deobandis prohibit it due to bidah done in mawlid and they don't regard the mawlid itself to be bidah
Deobandis infact consider the mawlid to be mubah (allowed) so they think a mubah action should be prohibited if it is accompanied by bidah.
The vast majority of the ahlus Sunnah scholars allow mawlid and the imperative reason that we need this in this day and age to rekindle light of iman in us when iman and 'amal are at an all time low makes sense to me
See:
https://www.deoband.org/2010/02/fiqh/miscellaneous/mawlid-deoband-and-hanafi-fiqh/
And anyway, let's say for example there is a valid view that the mawlid itself is bidah, even in this case, we do not condemn those who hold it valid as differences of opinion in fiqh is not condemned
I think we need to first understand what Bidah really mean and why every bidah is called misguidance which will lead to hell fire.
When we invent new things in the religion at the name of Bid-al-hasana, what exactly it means? It means that human beings (naouzubillha) have more knowledge from God. This means God (naouzubillah) forgot to tell us something and our scholars discovered through their infinite wisdom that such and such thing shall be part of the religion. This is exactly what Quran warned us about and that's exactly the reason why Quran told us stories of previous nations and told us how they changed the words of God for their worldly gains.
When Quran says that today your religion has been completed for you, it means that everything which can lead to Jannah has been told and everything which keep one away from hell fire has also been told. Our Prophet PBUH conveyed the entire message of Islam with sincereity and he PBUH did not hide anything related to religion from us. If he PBUH can tell us trivial things such as how to use the rest room, do you really think he PBUH forget to tell us the importance of celebrating his birthday? Did any of his companions or even tabieen celebrated his birthday? No, the first time his birthday was ever celebrated was more than 600 years after his death. In our time and age, people have invented invented mother's day, father's day, and Muslims have invented Prophet's day. Muslims don't have any specific day to respect their parents or to show respect to prophet PBUH, we make this part of our daily routine. We live by the Sunnah every minutes and every second. The best way to show love to Allah's messenger is to follow his Sunnah and when it comes to following his Sunnah, we follow our imams and reject his Sunnah. Are we then the followers of our imams or followers of Prophet Muhammad PBUH? Is not this the way of those who had the guidance but are still misguided (al-daaleen)?
If this is too hard to understand then let me give you a very simple example. Suppose you are offered your favorite dessert and you are told that it may be piousness. Would you eat it? No person in right mind will eat it because there is chance that you may loose your life. Same in the case with these newly inventions in the religion. We are warning you to stay away from these because these are innovations and can lead you to misguidance. The best approach is to play safe and only follow what Quran and hadiths tell us to do. If you choose the other path then surely that's the path of those who are misguided, those who think God forgot to mention some aspects of the religion or those who think Prophet Muhammad PBUH forgot to tell us the importance of celebrating his birthday. Anyways choice is yours.
[MENTION=36993]eesa the kiwi[/MENTION], is it possible that we discuss issues like this in a group which is for Muslims only? I hate to discuss our differences in an open forum as it only show how divided we are.