"...but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance." (2 Peter 3:9)
"Verily I say unto you, Whosoever shall not receive the kingdom of God as a little child shall in no wise enter therein." (Luke 18:17)
And praise God for His unfathomable mercy and grace.
Yes, there will be loss of rewards in heaven for those who are not faithful, but heaven isn't the reward itself.
God would rather have us with Him than not and I think He gives us more latitude than any of us give each other. Or even ourselves.
That's a father's heart.