I assume that you have heard of non-theistic religions, such as Buddhism and Jainism. While traditionally they accepted the existence of the various polytheistic gods and goddesses of common devotion, they held that those deities were irrelevant to their teachings. Many modernist Buddhists today are more close to atheists and don't believe in the existence of deities.
Even in the theistic religions there are elements of religious agnosticism that at times approaches religious atheism. John Scotus Eriugena wrote:
"We do not know what God is. God Himself does not know what He is because He is not anything. Literally God is not, because He transcends being."
What he meant was that God is not another item in the inventory of space-time-matter, the things that can be said to exist and that can be known by beings like us. Rather, God is the reason why the universe of space-time-matter and all the existing things exist at all.
In his theology, God cannot be known in essence, but only by whatever his effects are in the universe of being. Essentially the same theology remains basic in Eastern Orthodoxy today, in their essence-energies distinction. (They didn't get it from John Scotus Eriugena but rather from late antique neoplatonism.)
You assume, maybe coz I am from Hong Kong,
that I am familiar with Taoism, Buddhism, folk religions
and even Christianity?
I definitely dont need a lesson.
I am also familiar with the English language,
various definitions and, with the vice of equivocation.
All religions involve a belief in supernatural beings.
That is what a religion is.
Use the word some opposite way and its gibbersh.
(See Vice of equivocarion)
I dont do gods. (Supernatural beings)
I dont believe in them. I have no religion
Any claim that i do, that "atheist religion" exists,
is nothing but an insensible contradiction.
Which, btw for all the excursions into
" Eriugna" or whatev, you never addressed.
Religious atheist is a contradiction,
like hot ice or stationary movement.
Do you understand that?