He calls us to believe in His Son. This is impossible for a baby to do. Do you consider God so callous as to demand the impossible and then condemn on the basis of what He knows cannot be done?
I think it would be very, very presumptuous of me to call an action of God "callous" when I don't have all understanding and moral purity.
He may very well have a holy and justified reason for doing something that my sinful nature may not naturally see or respect.
He would not let a child die if He knew they would not believe otherwise they would have no knowledge as to why they end up in the lake of fire because they have no works that can be judged.
You need to understand something—that if I went by your logic above here, I would already reject God due to the problem of evil.
It's not "okay" with me that he lets babies be born deformed and sexually abused and never loved, and this I know 100% has happened.
It seems "calloused" to me and like God is a "monster" and the very opposite of "goodness, justice and love."
Now who is in the right, me or God? Who is the monster me, or God? Who is calloused, me or God? Who is evil, me or God?
See, when we base decisions on how we feel about something, we are not basing them on God as the ultimate value, but us.
I hear people say things like "If God did [such and such], I would never worship him, I would never accept a God like that."
That's rebellion against the Most High.