Gīta is like an encyclopaedia and no encyclopaedia is religious. Encyclopaedia consists of a concise of various informations regarding several topics. Bhagavad Gīta is exactly that. The several topics in it pertain to everything to do with a human life and his journey in creation. To call it religious, is to call a dog mad and kill it.
Bhagavad Gītā is well known to be a part of Bhīṣma Parva (Parva means section) in Mahābhārata. Mahābhārata is an ingenious story, and the characters, the protagonists, the antagonists, the side characters, all of them depict what a human journey goes through. But the genius lies in tracing and highlighting the events to
the inner mind of man. How his choices taken, unfolds the events in his life! The depth of the unfoldment is such that it takes an individual to know the source of his own being.
In the 17th chapter of Bhagavad Gītā, the three types preferences of food by three different kinds of people is mentioned. By knowing this, you know what sort of temperament you exhibit. It is a great tool of self-assessment!
रस्याः स्निग्धाः स्थिरा हृद्या आहाराः सात्त्विकप्रियाः ।।८।।
Foods which increase life, purity, strength, health, joy and cheerfulness, which are oleaginous and savoury, substantial and agreeable, are dear to the Sattwic people.
आहारा राजसस्येष्टा दुखशोकामयप्रदाः ।।९।।
The foods that are bitter, sour, saline, excessively hot, dry, pungent and burning, are liked by the Rajasic and are productive of pain, grief and disease.
यातयामं गतरसं पूति पर्युषितं च यत् ।
उच्छिष्टमपि चामेध्यं भोजनं तामसप्रियम् ।।१०।।
That which is stale, tasteless, putrid, rotten and impure refuse, is the food liked by the Tamasic.
(Translation from Bhagavad Gītā by Swami Sivānanda).
Is this classification of preference of food in anyway making a religious statement??
Every verse of the Gītā is useful to humankind to find his peace, even more so when he gets overwhelmed by how his life has unfolded and he gets clueless in many a moments during his life.
Gītā is a śastra vidya. Regarding this, in another post.