I'm not sure what your choices are, but here are some synonyms and phrases that me the same as Believed:
accept, admit, conclude, consider, have, hold, regard, suppose, think, trust, understand, accredit, affirm, buy, conceive, credit, deem, posit, postulate, presuppose, swallow, attach weight to, be certain of, be convinced of, be credulous, be of the opinion, count on, fall for, give credence to, have faith in, have no doubt, keep the faith, lap up, place confidence in, presume true, reckon on, rest assured, swear by,take as gospel, take at one's word, take for granted, take it
Hope This Helps!!!
-AnimeDabGirl
