Trade allowed other cultures to influence aksum in many areas, including religion, as evidenced by the fact that in the 300s, was declared aksum's official religion.

Christianity.

Explanation:

Since the early 1st millennium CE, Christianity had been brought to Aksum territory (today´s Ethiopia, Eritrea, Djibouti, Somalia, and Somaliland) by traders and Egyptian missionaries. Eventually, under Ezana (fl. 320–360) Aksum embraced Christianity, due to the the kingdom´s significant trade relationships with the North African territories of the Roman Empire.