*agrees with Willow and Novadar*
We have freedom in allegory, as long as we don't teach something wrong. There's a difference between being creative, and making a sloppy or even completely wrong theological point. Jesus did not use "perfect" allegory in all of His parables, but He also did not teach wrong things through them.
Using your example:
Dr. W. Eli McGowan wrote:
For example, if I write a story about a little magician who makes a garden, and populates it with little children whom he loves, but who then run from him, and he goes after them to bring them back into the fold, do I have to also make sure to include some sort of trinity?
You don't need to include the Trinity, because the point of the allegory is about God's love. It doesn't say there is
not a Trinity or that it is a Duality. It also does not say God is exactly like the little magician. It is just a story illustrating a truth.
If, however, the magician gave a speech to the children about how they would all go to the magical garden in the sky whether they came back to the fold or not, then it would be saying something theologically wrong. That is the difference, and what we have to watch out for.
Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter. -- Isaiah 5:20