Belief is an indwelling response to recieved information.
No you can not choose what you believe without willfully being ignorant while knowong the truth only to later convince yourself of a lie you made to yourself.
If I told you fire was cold, you would not believe me because the information you have previously recieved has shown you differently.
If you wanted to believe you can fly to the moon.... you would know better....
To believe IN Christ would be to place your trust, confidence, fidelity and belief in HIM as YOUR savior.
4102. pistis
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Strong's Concordance
pistis: faith, faithfulness
Original Word: πίστις, εως, ἡ
Part of Speech: Noun, Feminine
Transliteration: pistis
Phonetic Spelling: (pis'-tis)
Definition: faith, faithfulness
Usage: faith, belief, trust, confidence; fidelity, faithfulness.
HELPS Word-studies
4102 pístis (from 3982/peithô, "persuade, be persuaded") – properly, persuasion (be persuaded, come to trust); faith.
I know I have eternal life, and I have seen Gods works in me. He is no less real than the heat of fire to me. No I can not unknow my Father. It is impossible. No new information will suggest He failed me because I know He works in ways beyond my understanding. If my understanding for some reason was lost, my faith, belief, trust, confidence would still remain. (because I do indeed BELIEVE of Christ and in Christ)