Hi dear
Please be strong, I'm sure your application will be approved ,the reason I asked about your religion was you mentioned about the NIKAH certificate.
I have seen a application very closely (my neighbour in Punjab), the bride was Christian (applicant ) and groom was Muslim (sponsor) , they had love marriage ,short courtship ,marriage without parents .In Interview girl was specially asked very tough questions even why she converted to Muslim and parents not present .Luckily they passed the interview and now she is Canada with her husband .
I strongly believe Visa officers should not discrimanate (on the basis of color ,caste or religion ) ,specially (Canadian high commision).The questions they asked your hubby were just to check his temperament and your relation ,they were trying to provoque your hubby ,however the best thing was he remained calm .
We all forum members will certainly pray for your husband's Visa .
God bless you .