What's the difference between atheistic and atheous?

Atheistic

Definition:

(a.) Alt. of Atheistical

Example Sentences:

(1) Maryam Namazie, an Iranian-born campaigner against religious laws, had been invited to speak to the Warwick Atheists, Secularists and Humanists Society next month.
(2) The reason to be an atheist is not that it makes us feel better or gives us a more rewarding life.
(3) My views almost six years ago would be considered by the Australian government as extreme and myself an Islamic extremist, although I was still an Atheist, a little confusing I know,” he wrote.
(4) Expressing the belief that it was important for Christians to engage in "a sincere and rigorous dialogue" with atheists, Francis recalled Scalfari had asked him whether God forgave those "who do not believe and do not seek to believe".
(5) Ultimately, it suggests the question: had he actually been Muslim, or instead been Hindu, Jewish or atheist, would he be any less American?
(6) Even Roberts couldn't dictate terms to the almighty, which may have been why he was an atheist.
(7) Eight members of the banned Ansarullah Bangla Team (ABT), including a senior cleric who is said to have founded the Islamist group, were convicted late last year for the murder of atheist blogger Ahmed Rajib Haider in February 2013.
(8) Now I’ve found some of my favourite comedy here: the anarchic young sketch groups, Stewart Lee’s Top Gear bit, James Acaster’s bit on apricots and Daniel Sloss’s unapologetically dark atheist stuff spring to mind.
(9) Atheist offenders will have their beliefs challenged too, by those who say Muslims are a persecuted minority who deserve protection from the dominant culture.
(10) No it's not, says atheist "pastor" Sanderson Jones .
(11) Rome: Open City stars Fabrizi as a priest, Don Pietro, who aids the Italian opposition and forms a close bond with an atheist, communist resistor.
(12) In Omaha, Nebraska, several atheist and humanist groups planned to visit the local Islamic Center on Saturday to express their support .
(13) Whatever delusion turns you on just don't expect me (an atheist) to go along with it.
(14) I think it's in Kansas, you'll have to fact check that, that they're not teaching evolution theory anymore, and apparently there was an online poll of English teachers, British teachers and it was something like 60% thought it should be taught alongside creationism, which for me is really shocking, but... Like I say, I don't think it is a film about atheism, but for me, as an atheist, to have a viable alternative is incredibly important.
(15) The figures neatly reverse the proportions among those who identify as religious, only 5% of whom are convinced atheists.
(16) A moral framework provided by religious belief is also likely to influence behaviour, with atheists more likely to keep the money than those who associate with a religion.
(17) More importantly still, this is only one view, and most atheistic outlooks contain no such consolations.
(18) With the use of computer graphics, the film portrays the sweep of Balkan history as a prolonged expropriation of inherently “Muslim lands”, first by “crusaders”, then atheistic communists, and finally nationalists.
(19) American sceptics, atheists, scientists and science educators are engaged in numerous battles.
(20) Speaking to Eugenio Scalfari, a co-founder of the Italian daily newspaper and an atheist, who exchanged letters with Francis over the summer, the Argentinian pope said he agreed it would be difficult to reform the Vatican .