How can a Muslim be a merchant in a country that relies on usurious transactions, such as banks or stores, without dealing with them, especially if the trade necessitates dealing with usurious banks, credit cards, and post-dated checks, and what is the alternative if this trade is forbidden?

A Muslim must be more concerned with the soundness of his religion and his Hereafter than with his worldly life, and he must prioritize the pleasure of his Lord above all else. If a Muslim adheres to this, he will be content with a simple job or trade that does not require him to commit forbidden acts, such as usury (riba), against which Allah has declared war on those who deal in it. A Muslim must fear Allah so that He may make a way out for him and provide for him from where he does not expect. Usury is not permissible except in extreme necessity where one fears for his life.