When is a Religious Belief Delusional?

[Amarok]

I say that triangularity would exist in potential even if the physical universe had never come into being to manifest objects that sentient organisms would recognize as triangular.  Is my belief in triangularity wrong or delusional?

Pure Edward Feser drivel that in way reflects reality triangles neither require platonic nonsense or require a god to exist or be recognized as what they are.