It's spiritual without being theological. So your question seemed to challenge the spirit of the poem. Which I see now is what you wanted to do. I wanted you to roll with the poem but I'll try to roll with you instead.
From a poetic perspective, God is often represented as all-good. But not always. Blake wrote Tyger Tyger and wondered how God could make both tigers and lambs. So he asks the same question you did. But no answers there either.
Western theologians try to answer the question of evil in the world. Their answers are worthless. It's because they wish to preserve the idea of God as all-good. I am not sure when an all-good God came about. Some say it came from Zoroastrianism, probably during the Babylonian exile.
The ancient Israelites don't seem to have had that view. As many have noticed, the stories mostly show a nasty God, demanding, quick to anger and randomly choosing favorites. Drop the idea of a good God and the stories make much more sense. It's a cruel God for a cruel world. Theologians twist themselves in knots to avoid this obvious conclusion.
Poets these days are more honest than theologians. This poem does not claim God is all good. It doesn't even say there is a God. It just asks the question. There is death, but no heaven awaits. It's just about living this life. Which, IMHO, makes it spiritual.
I don't think you are wrong for asking the hard questions. But people don't like those questions because they need to think God is good. 2500 years of conditioning has caught them in an illusion they don't want dispelled.
Illusions are enjoyable. For a moment this winter I was reminded of summer and grasshoppers and the wonder of it all. You broke the spell. Which is fine because we can't live in illusions, we can only visit. But picture those poor religionists, trapped in a 2500 year-old illusion, desperately trying to stay. Of course they are unresponsive and angry when you try to rouse them.
As I said, poets are more honest than theologians. They make you imagine, they ask questions, but don't pretend to have all the answers. There is a real spirituality in poetry that's not about pretending that life is something other than it is.
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