The kuffar, in general, hate the concept of Caliphate or Muslim Ummah or Muslim brotherhood, especially Indians because they believe they lost the land of Pakistan because of Muslim Unity and would much rather have the Muslims of Pakistan, India, and Bangladesh to disassociate themselves from Islam and the Muslim world and embrace hindutva and hindustani culture, but we all know most Pakistanis associate themselves with the Muslim world than hindustan.
If Muslims all across the Muslim world get united, then Muslims will become stronger and that is the worst nightmare for the kuffar, the enemies of Islam.