Spiritual don't mean allegorical but allegorical can mean spiritual..
"Flesh is flesh and spirit is spirit" -Jesus..
God is Spirit and those that worship him MUST worship in spirit and truth.. The Spirit can speak metaphorically and metaphors can speak of the Spirit.. but the Spirit is not a metaphor and a metaphor can be reality expressed..
All Spirits are living persons and all metaphors are parts of speech but are NOT living persons..
"Flesh is flesh and spirit is spirit" -Jesus..
Apparently Jesus didn't share such a "flexible" sense of definition.