It is not a matter of a big or a small religion as per one of your comments above.
Religion is not like politics where the numbers do count to govern.
Religion is more a matter of spirituality or divinity and one being drawn towards it, and above all being human beings, not fanatics nor terrorists, or inflicting pain and injustice on all others who do not agree with their faith.
This attitude is utter madness and regression in almost all fields.
Sikhee as per teachings of Guru Sahiban and Bhagat Jan, are more noble, humanitarian, which brings positive balance in our lives, and through love and devotion to that UniversalTimelss Truth, reunites the soul to its Origin, Waheguru.
Regarding the other point of what happens to the people of other faiths.... Well that much can be said, that they are bound by their karam, unless some day they are fortunate enough to come and derive the most of benefits and goodness, from the teachings of Sikhee.