Well, Satan has betrayed many of us, we think, we are Arabs, Irani, Iraqi, Indians, Pakistani, Indonesians. But this is not our Lord (swt) thinks, nor our Prophet (sws) think this way.
Muslims are just one nation, and our identity is Allah (swt) and His Messengers.
If you want to love Muslim Ummah, then recite Surah Al-Kafirun, I have felt this surah’s effect on my heart.
Also, Prophet (sws) said.
The Muslim Ummah is like one body. If the eye is in pain then the whole body is in pain and if the head is in pain then the whole body is in pain.
Take your brothers and don’t despise them whether they are sufis, brawlevis, shia, sunni, wahabi, deobandi, they all constitute a Muslim Ummah. You should try to guide them but never despise them, because it will neither benefit you nor Islam nor whole Muslim Ummah.
As we are divided into false nations, Allama Muhammad Iqbal said.
IN TAZA KHUDAON MAI BARA SAB SE WATAN HAI
JO PERHAN IS KA HAI WO MAZHAB KA KAFAN HAI
In the recent false gods, nation is most great
The home of this false god is a coffin of religion
As far as Habul-Watni (love for country) is concerned, we all love a place where we are born, but think wide, all of this earth is our Watn (country).
Allama Iqbal said,
chino arab hamara, hindustan hamara
muslim hai ham, watan hai sara jahan hamara
China belongs to us, India belongs to us
We are Muslims, entire earth belong to us
Then our elderly people said
Unity is strength.