فَـَٔامَنُوا۟ (And they believed) is a past tense verb — the action already happened and is complete.

We translate it in past tense — "did", "created", "said", etc.

فَـَٔامَنُوا۟ (And they believed) uses form IV (أَفْعَلَ) — the أ at the start makes it causative ("to make someone do something").

We translate it as "to make [someone] do" or "to cause [action]".

فَـَٔامَنُوا۟ (And they believed) starts with فَ, which means "and then" or "so" — it shows sequence or consequence.

We add "and then" or "so" to show the order of events.