When Krishna says ChaturyaVarnam mya Srishtam it applies to the whole of mankind and not only to Hindus

Translation: "According to the three modes of material nature and the work ascribed to them, the four divisions of human society were created by Me. And, although I am the creator of this system, you should know that I am yet the non-doer, being unchangeable."

Bhagavad Gita. 4.13

The meaning of the above sloka is that the 4 Varna are created by Shri Krishna (here 'I' is not used as a reference to the self but to the creator) and the division is based on Guna and Karma of the person.

Every human being can be placed in either of the 4 categories and no one is left without a category. It doesn't matter if the person is Vedic, Christian, Buddhist, Jain, Muslim or Atheist.

Yes, that's true. The concept is universal. It applies on everyone, no matter if he is a man living in Sahara or Aboriginal women living in the wilderness of Australia. Take a note that Varna and Jati (Caste) are completely different.

Let's have a look at these 4 Varna:

1. Brahmin

Brahmin Varna is the most difficult to sustain and utmost rare. But, they are very respectable in society. 

A person belongs to Brahmin Varna if he/she is fond of knowledge. That person, find his soul in peace when he/she create something. And that knowledge is created for the welfare of the entire Srishti.

He/She does not prefer to exchange his knowledge, his work with any type of monetary gains. Yes, he/she naturally has the feeling that all the knowledge has always been present and he/she is just sharing it with the world. 

For example, Maharishi Patanjali created Yog Sutras but he never asked for IPR. Such persons deserve respect and are held in high honor.

2. Kshatriya

Kshatriya, are the people who accepts challenges. For them, nothing is higher than their self-respect, not even their life.

They love the feeling of achievement. A mountaineer who accepts the challenge to scale Everest is a Kshatriya. A wrestler out in the arena to take on his opponent is a Kshatriya. A soldier willing to live and die is a Kshatriya.

3. Vaishya

Vaishya's are the people who like to earn some commission in  return of some trade. Consider every Entrepreneur, every Scientist, every trader as Vaishya. 

It's a great myth that a person using his brain is a Brahmin. As mentioned earlier, Brahmin expects nothing in return and he/she is happy to share his/her work freely. 

Scientists file patents and IPR to protect their work and earn a royalty. They are trading for something, hence a Vaishya.

4. Shudra

People in this category willingly provide service to other categories.

So, we all Computer, Mechanical, Electrical and dash dash dash employed for a monthly remuneration are Shudra.

This is the age of Shudra. People with fat salaries are exalted. Knowledge is getting replaced by money. IITs are no more in the news for groundbreaking innovation, but, they are in the news for a crore package. 

Finally, the most important inquiry is identifying our varna. Identifying our Varna bring out the best in ourselves. Mind it, this is very very difficult. When I sit back and ponder where do I belong, my mind runs with the speed of light and vanishes into the black hole.

When I consider my Karma, I am serving someone that means I am Shudra. But then I feel that I do not love what I am doing now. This is not my guna. Take the next one. Ah Yes, I would like to setup a business someday, no matter how small it remains. Doesn't it mean I am Vaishya? But wait, I like taking challenges. I enjoy going on a solo motorcycle into the unknown. And sometimes, I feel, I should do something for the society.

And it goes round and round.

I am still waiting to identify my varna. If you have identified yours, that is a great news. Keep moving and success will be yours.

-Niraj

Note: Multiple scholarly lectures is the source of the above article. Only the words and flow are mine :)

No Varna is superior or inferior. Society cannot function without any of them. Each has equal importance.