Atheist & A Brahmin
Atheism existed as an undercurrent of Hinduism atleast since 600 B.C. from the time Charvaka (or Charvaka-I, as some would like to name him to distinguish him from the later Charvakas) coined his philosophy. Charvaka's philosophy did not accept the existence of either God or Brahman, and so was clubbed with Buddhism and Jainism (which too rejected the concept of God / Brahman) as Sunyavada.
It appears that the society was more open to divergent thought in the Vedic period. So, though amounting to heresy, Charvaka's School as well as its guide-text, the Brihaspathi Sutra, were allowed free currency. Philosophers belonging to the Charvaka line were invited to the scholarly gatherings, where fierce debates would take place on the existence or the absence of God / Brahman. While treatises were being written against each other's arguments, apparently no restriction on freedom of expression was in vogue (a view expressed by Dr. S.Radhakrishnan).
While Brihaspati Sutra itself got lost, Sri Madhvacharya quoted verbatim from the said text in 14th Century A.D. (in the process of refuting Charvaka's tenets in his Sarva Dashana Samgraha), which today gives us a glimpse of what exactly the philosophy of Charvaka was:
While life is yours live joyously;
No one can avoid Death's searching eye:
When this body of ours is burnt,
How can it ever return again?
That the pleasure arising to man
from contact with sensible objects
is to be relinquished because it is accompanied by pain,
is the reasoning of fools.
Here the Charvaka School differs from Jainism & Buddhism that advocate relinquishing wordly pleasures.
The kernels of the paddy are rich with finest white grains,
What man, seeking his own true interest, would fling them away
because of a covering of husk and dust?
The Sacrifices, the three Vedas, the ascetic's three staves,
and smearing oneself with ashes,
according to Brihaspati are but means of livelihood for those who
have no manliness nor sense.
(very strong statement indeed!)
Charvaka School accepted only four elements - earth, fire, water and air - and refuted the fifth one - Akasha or aether - as nonsense. It said that knowledge is a product of these four elements, and gets destroyed when these elements in the body are destroyed, i.e., consciousness perishes with the body, or there is nothing after the body perishes.
Springing forth from these elements itself,
solid knowledge is destroyed when they are destroyed.
After death no intelligence remains, thus spake Brihaspati.
There is no heaven, no final liberation,nor any soul in another
world, Nor do the actions of the four castes,orders,
or priesthoods produce any real effect.
The following verses are Charvaka's pun on sacrificial offerings:
If a beast slain as an offering to the dead will itself go to heaven,
why does the sacrificer not straightway offer his father?
If offerings to the dead produce gratification
to those who have reached the land of the dead,
why the need to set out provisions
for travellers starting on their journey?
(=Why not send them directly?)
If our offering sacrifices here gratify beings in heaven,
why not make food offerings down below
to gratify those standing on house-tops?
While life remains, let a man live happily,
let him feed on butter though he runs in debt;
When once the body becomes ashes,
how can it ever return again?
In Telugu, the above verse can be summarized as "Appu Chesi Pappu Koodu". I am sure there will be an equivalent in Tamil.
If he who departs from the body goes to another world,
why does he not come back again,
restless for love of his kin-folk?
It is only as a means of livelihood
that brahmins have established here
abundant ceremonies for the dead -
there is no other fruit anywhere.
Hence for kindness to the mass of living beings
we must fly for refuge in the doctrine of Charvaka.
While reading the above verses, we must not forget that Charvaka himself was a Brahmin. He must have got thoroughly disillusioned with the ritualism in vogue during those days to say these things.
Charvaka picked on certain grotesque rituals that accompanied Yagas such as Ashwamedha (please do your own research to know what these were), and very strongly rebelled against them. He said:
The three authors of the Vedas were buffoons, knaves, and demons.
All the well-known formulae of the pandits such as jarphari and
turphari, and all the obscene rites for the queen commanded in
Aswamedha,were invented by buffoons, and so were the various
kinds of presents to the priests,while the eating of flesh was
similarly commanded by night-prowling demons.
It appears that while he advocated balanced enjoyment of earthly pleasures, Charvaka was against the animal sacrifices and eating of animal flesh. He wanted some kind of reform in the religion as it was practised then. Since the name Charvaka means, "the one who speaks sweetly," Charvaka must have been a soft-spoken man who possessed good oratory skills, and must have been popular with the masses who were experiencing some kind of revulsion towards ritualistic religion. I do not know though, what Jarphari and Turphari (to which he was referring to in the above verse) were.
A few Hindus / Brahmins apparently have not seen any contradiction between being an atheist and being Hindu. Vinayaka Damodar Savarkar, or Veer Savarkar as he is referred to, was an atheist (not withstanding the fact that he was a Chitpavan Brahmin and one of the founders of Hindu Mahasabha, and was also named in the "Right Wing Hindu Plot" to assassinate M.K.Gandhi). Those who consider Hinduism as a way of life rather than a religion sometimes extend strong arguments to be an Atheist and a Hindu. When these people call themselves Hindu / Brahmin, the word rather refers to the cultural aspects of Hinduism / Brahminism.
Those who have read Valmiki Ramayana would remember a sage, Jabali, who comes to Rama in the forest after he abdicates the throne in favour of Bharatha (Ayodhya Kanda : Sarga 108, 109 & 110). Jabali urgen upon Rama to default and go back on the promise made to his father Dasharatha, giving several atheistic arguments, as to why Rama should not bother about the promise made to his father or the "other world", and why he should think only about this world. Rama gets taken aback by this preaching by a sage, and questions Jabali as to how a sage could advice him this way? Vasistha does a timely step in, and saves the situation. "Brahmin atheists" or "atheist Brahmins" have been around since those times.