[Vision2020] Atheism to Defeat Religion By 2038?

[Chasuk]

Atheism can be simple nonbelief in the existence of God, or the
positive belief in the nonexistence of God. As I have already
indicated, the former applies for me.

As for "creditable" sources...

>From the Oxford Dictionary of Philosophy:

"Either the lack of belief that there exists a god, or the belief that
there exists none."

>From the Oxford Dictionary:

"Disbelief or lack of belief in the existence of God or gods."

>From Princeton University's WordNet:

"A lack of belief in the existence of God or gods."

Are those sources trustworthy enough for you?