faith, truth, fidelity, trust
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信 centers on a bond of reliability between people: faith, trust, and fidelity. Truth is the foundation that makes that bond possible.
distribution (of information, news, etc.); broadcast; delivery; transmission; streaming (over the Internet)
to believe; to believe in; to place trust in; to confide in; to have faith in
correspondence; communication; transmission; news; signal; telecommunications
trust (in); confidence; faith; reliance
confidence; trust; faith; reputation
self-confidence; confidence (in oneself)
signal; signalling; signaling
transmission; sending
receiving (a message, letter, email, etc.); reception (radio, TV, etc.)
dispatch; despatch; transmission; submission
(religious) faith; belief; creed
conviction; belief; confidence
reply (e.g. email, fax, letter); answer
to believe; to believe in; to place trust in; to confide in; to have faith in
honesty; sincerity; fidelity
believer; adherent; devotee; follower
belief; faith; conviction
trust; entrusting; leaving in someone's trust
distrust; mistrust; disbelief; discredit
creed; belief; conviction; article of faith
telecommunications; correspondence
belief; faith; adherence; espousal
credit union
layman; believer; adherent; follower; laity
信 combines 亻 (person) and 言 (words), suggesting that a person's words are the basis of trust and truth.
A person 亻 standing by their words 言 creates trust. When someone's words are reliable, you have faith in them.
For シン, imagine a person whose words are so true that they feel like a trusted shinobi (しのび) confidant: shinobi -> シン, and that trust is unbreakable.