This is another one of those "how many angels can dance on the head of a pin" topics.
Let God figure it out. What we need to do is just preach the gospel, teach holiness, and remember that God is as merciful as possible and as just as necessary. Only the heathen gods mentioned in scripture would send babies into the flames. The one true God "is not willing that anyone perish" and would never be less just and compassionate than his creatures. Only Satan exercises raw sovereignty in a moral vacuum. And if we, "though we are evil, know to do good, then how much more your Father in heaven?"
God is not Zeus, sitting in heaven poised to throw lightning bolts at the first hint of sin. He who counts the hairs on our heads and knows when a sparrow falls to the ground, will certainly not charge babies, or the mentally incompetent, with rebellion.
That would be true if God had not plainly given us the answer to the question. Amazing what is in scripture we don't see yet.
God also gave the age.
So, before we go speculating saying....... "WE DON'T KNOW!!!" reading scriptures just might help. You say God certainly won't charge babies, but where is your scripture? Jesus was talking to those who knew God, what if the Parents of the children don't know God? what if the Children don't know God, then what? We just don't guess we go find the answer.
1) Man was accounting for seeing those things God did "MANY TIMES" yet they did not hearken to them and were full of unbelief.
Man is responsible for what He see's from the Lord.
Num 14:22 kjva
Because all those men which have seen my glory, and my miracles, which I did in Egypt and in the wilderness, and have tempted me now these ten times, and have not hearkened to my voice;
Jesus said, "
At least believe me for the Works sake"
2) Those "MEN" are then singled out who ignored all God did, and were full of unbelief except for the Men who did not.
Num 14:23-24 kjva 23
Surely they shall not see the land which I sware unto their fathers, neither shall any of them that provoked me see it: 24 But my servant Caleb, because he had another spirit with him, and hath followed me fully, him will I bring into the land whereinto he went; and his seed shall possess it.
3) The land God sware to their fathers, the promised land, the good land. God told Abraham that his Seed shall be as the stars, and that he would bring the people out to the promise land. (Gen 15:13-14)
Heb 11:8-13 kjva 8 By faith Abraham, when he was called to go out into a place which he should after receive for an inheritance, obeyed; and he went out, not knowing whither he went. 9 By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles with Isaac and Jacob, the heirs with him of the same promise: 10
For he looked for a city which hath foundations, whose builder and maker is God. 12 Therefore sprang there even of one, and him as good as dead, so many as the stars of the sky in multitude, and as the sand which is by the sea shore innumerable. 13 These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them, and confessed that
they were strangers and pilgrims on the earth.
4) This promised land, the land of Milk and Honey was earthly. A shadow of what was to come, a house built by God in the Heavenly. God is dealing with Israel because of their unbelief, they did not see that promised land. Just like today, unbelief will keep many out of Heaven to come.
What did God say concerning the Children of those unbelieving parents though?
Num 14:29-31 kjva 29 Your carcases shall fall in this wilderness; and all that were numbered of you, according to your whole number,
from twenty years old and upward,
which have murmured against me, 30 Doubtless ye shall not come into the land, concerning which I sware to make you dwell therein, save Caleb the son of Jephunneh, and Joshua the son of Nun. 31
But your little ones, which ye said should be a prey, them will I bring in, and they shall know the land which ye have despised.
God said, those twenty years old and upward which murmured against me, are accountable................. They will die.
God said, even though the parents said their own kids would be pray, despite them siding against me, your little ones............
WILL I BRING IN TO THE LAND OF PROMISE.
19 and younger, God brought into the promise land. The sign of a place in Heaven to come.
God has not changed, nor does He ever change.