More Religous One of the most effective ways to revive a religion is to integrate it in our culture. For example not all middle easterners are Muslims but many of them partake in Muslim traditions. Another is how not all Americans are Christian, but many none Christian still partake in Christmas. It's integrated in our culture as a part of tradition.
The African empires of Kush and Aksum resembled later empires in Africa as they grew powerful through trade. This is so they began to sell resources and in addition to that handmade woven goods were also produced and sold.