How do you know about all Muslims?
If i speak for myself i will never ever convert any girl into Islam just because she could marry with me or i could make her my wife. conversion should only be after acceptance the message of Islam from deep heart without any compulsion or worldly Motive. I know there are some people who don't follow Islam themselves but want to bring every other non Muslim into Islam which is stupid. Its quality which matter not quantity
Your marriage might be legal according to civil law but not according to Islamic law . Ask any expert there or search it by yourself : )