Christianity and Hinduism are both man made religions that fail humanity. Much of what muslims do also fail due to man made ideas swamping Allah given Revelation.
Why were muslim scientists, not atheists, so far advanced at one time? Islam had a glorious past, scientifically, because the Quran says to look to the signs of Allah within and without oneself, as well as saying numerous times "do you not see how" this and that so that we are forced to do science. The muslims lost this and made a religion of rituals. When they 'revert' back to the pure Islam, they should once more advance both in the humanities and scientifically.
Atheism has no moral or ethical boundaries. What is good for one person may not be good for another, so we need a way of life, a Deen, that balances and checks what we do.