People were sick, suffering, hungry, and begging for help, yet he could not heal them. Instead, he went to split the moon.
How did splitting the moon feed the hungry, cure the sick, or help the people standing right in front of him?
Face ID is the best option here for security + convenience. It's much harder to spoof than Touch ID, PINs (which can be shoulder-surfed), or patterns (easiest to guess/smudge).
For max protection on any phone, use Face ID/Touch ID with a strong PIN or alphanumeric password as the fallback. Biometrics alone aren't foolproof against determined attackers, but they're ideal for daily use.