3 synonym groups for Believe

follower, supporter, devotee, disciple, advocate, believer, enthusiast, partisan, backer, ally, proponent, adherer, upholder, champion, fan, zealot, aficionado, adherent, loyalist [x]

persuaded, assured, certain, confident, sure, positive, satisfied, over, convinced [x]

believe, think, consider, hold, maintain, feel, reckon, suppose, assume, judge, deem, view, regard, opine, surmise, conclude, assert, contend, affirm, insist, argue, posit, theorize, hypothesize, presume, postulate, conceive, fancy, imagine, guess, suspect, estimate, perceive, sense, intuit, deduce, infer, gather, understand, comprehend, grasp, apprehend, recognize, acknowledge, accept, concede, admit, appreciate [x]