Peter speaks of a "roaring lion" on the prowl. I don't think anyone thinks that an actual lion is the problem. Nor does the Satan eat humans that I'm aware of.
[1Pe 5:8-11 CSB] (8) Be sober-minded, be alert. Your adversary the devil is prowling around like a roaring lion, looking for anyone he can devour. (9) Resist him, firm in the faith, knowing that the same kind of sufferings are being experienced by your fellow believers throughout the world. (10) The God of all grace, who called you to his eternal glory in Christ, will himself restore, establish, strengthen, and support you after you have suffered a little while. (11) To him be dominion forever. Amen.
Given the then current persecution is it possible that the "roaring lion" is his unregenerate people in cahoots with Rome? Notice the references to the People roaring over the Messiah like a lion and the "many rulers" that trample God's vineyard (his People):
[Jer 12:7-10 NLT] (7) "I have abandoned my people, my special possession. I have surrendered my dearest ones to their enemies. (8) My chosen people have roared at me like a lion of the forest, so I have treated them with contempt. (9) My chosen people act like speckled vultures, but they themselves are surrounded by vultures. Bring on the wild animals to pick their corpses clean! (10) "Many rulers have ravaged my vineyard, trampling down the vines and turning all its beauty into a barren wilderness.
The association of a "roaring lion" with a "powerful ruler" runs deep:
[Pro 28:15 CSB] (15) A wicked ruler over a helpless people is like a roaring lion or a charging bear.
[Eze 22:25 CSB] (25) "The conspiracy of her prophets within her is like a roaring lion tearing its prey: they devour people, seize wealth and valuables, and multiply the widows within her.
[Pro 19:12 CSB] (12) A king's rage is like the roaring of a lion, but his favor is like dew on the grass.
[Pro 20:2 CSB] (2) A king's terrible wrath is like the roaring of a lion; anyone who provokes him endangers himself.
The persecution of the time I'm referring to is the practice of Jews accusing Christians of practicing an illegal religion. If the Christian did not recant they would be charged with a capital offense.
Might the "adversary, the devil" actually be the Jews in cahoots with Rome?
Update
The question was raised as to whether Jews would "devour" a corpse either. I think perhaps the devouring is more in extracting economic benefit from the dead. The practice of denouncing a Christian as practicing an illegal religion was often prompted by financial incentive. For example, one might owe a Christian a large sum of money and opt rather to accuse them so they would die and you would keep the money.
Related:
[Eze 22:25 CSB] (25) "The conspiracy of her prophets within her is like a roaring lion tearing its prey: they devour people, seize wealth and valuables, and multiply the widows within her.
[Eze 22:27 NKJV] (27) "Her princes in her midst are like wolves tearing the prey, to shed blood, to destroy people, and to get dishonest gain.
[Mar 12:40 CSB] (40) "They devour widows' houses and say long prayers just for show. These will receive harsher judgment."