Is it permissible to take a Riba-based (usurious) loan from a bank so as to open a store
by which I can dispense with working in businesses that are managed by non-Muslims?
It is impermissible for you to take an interest-based loan from a bank or other financial institution for the above-mentioned purpose or any other reason because this kind of loan is regarded as a forbidden Riba (usury/ interest) according to the Qur'an, Sunnah and Ijma` (consensus of scholars).
May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!