In the Ramayana there is a reference to sage Jabali who was connected with the court of king Dasaratha. Jabali was a teacher to Rama and his brothers. Jabali informs his pupils about atheism also. This clearly shows atheism was very much prevalent in those days as something to be taken note of and Jabali as a teacher did not want his pupils to be ignorant of it. Vana Parva of Mahabhrata clearly indicates that Draupadi, her father and brother were once guided by a brahmin who was an atheist.
Every body has a beginning.
If he guides and controls merits and demerits, he becomes dependent on them. The doctrine of the Sutra is called Charvaka Lokayata . Lokayata means world. Only this world exists. Nothing beyond and nothing after.