Can Buddhist marry non Buddhist? I have relationship with non Buddhist, and we both thinking seriously about marriage. My family could not accept him because he is not Buddhist. But as I learned so far , Buddhism teach us to love and respect all religion. Can I  marry him?
What a Buddhist should do is:


Lead a moral life which is beneficial to others and to oneself.
Try to develop control over your mind rather than be a slave to it.
Try to develop an understanding of the true nature of phenomena and reality (cause and effect) with relation to the psychological impact which cause misery and use this understanding as a leverage to come out of misery.


So this question boils down to if a physiologist can marry a surgeon or engineer or some one who subscribes to a non-scientific dogma. There is no issue.

But again marriage comes with other responsibilities and issues afterwards. You have to think through how you can handle these before hand. Also evaluate the impact it might have on your personal development and meditation, and see if there are any personal "costs" involved, but again this is up to you.