What is the ruling on taking a usurious loan from a bank to buy a house for marriage, knowing that there are no Islamic banks in Morocco, and that delaying marriage to collect money might delay the completion of one's deen? And is this considered a necessity?

Dealing with Riba (usury/interest) is forbidden and is considered one of the major sins. It is not permissible except in cases of dire necessity, and marriage is not one of them. It is advisable to seek other means to secure housing and not to succumb to doubts, for Allah has promised ease for those who experience hardship and provision for those who fear Him. And whoever gives up something for the sake of Allah, Allah will compensate him with something better.