If Islam was enforced on you people then after 1000 years of rule no Hindu left but still you are majority in India.
Initially Sikh was considered a Muslim sect which creates problem but now this problem solved now they are like our brothers who are also fighting with you for freedom like Kashmiris and many more.
From where you bring this theory of 1000 yrs rule ? Mughals barely ruled for 300+ yrs.
First ruler
Babur-->1526
Last ruler
Bahadur Shah Zafar-->1857
and after 200 yrs of their rule, they lost steam and started to loose their territories.
Why one had to become Sikh to confront tyranny of Mughals? Why he couldn't do it by retaining Hinduism?
It was not a sikh faith but Khalsa panth which later on became sikh religion.
They were left with no option other than taking swords in hands and Guru Gobind singh initiated it. Those who followed this panth became sikhs.