Matthew 18: 3
“Truly I say to you, unless you are converted and become like children,
you will not enter the kingdom of heaven.”
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Yes Love is what matters, the very idea of bickering among God's children must be abhorrent to Him.
I think the key is actually in being 'converted' - not something we would be likely to do lightly these. As for childish behaviour - well, not all of it is naive or necessarily childish whereas innocence is the spirit and meaning of love...