What are the specific benefits for canada if we accept many syrian refugees (or refugees in general from any country, for that matter), and what can they do for us, to our country? why do we need them just as much as they need canada?

Birth rate rise, filling in deficient jobs.

Explanation:

Canada already has over five million immigrants from all over the world. They turned out to be a great implementation in Canadian society. Society can have different benefits by receiving foreign immigrants. Some sectors of Canada lack the workforce that could be filled by the influx of new migrants.

Because of this, Canada needs a certain number of migrants, because the arrival of new workers would have a positive impact on the economy. There are several groups of migrants, many young people, which would have a positive effect on Canadian birth rates.

unless they converted, many non-christians (mainly jews and muslims) were persecuted

d.) continue to rise rapidly