I like Muslim girl .. how can I propose her?

i like a Muslim girl.she is very religious and i think she likes me..no matter i like her very much..we r living in Canada..she is from Pakistan..the problem is how should i approach to her..she is going out with me..talks to me well..but i am confused whether its the friendship or love from her side?
but i don't want to waste this oppurtunity..i want to propose her what would b the best way?
what should i say?

And after proposing her, will you be able to be with her for always ?

Because here there are so many inter-caste love relation problem so if you think you have dare to be with her always then go ahead just propose her or else , take step back before ruining things for both.