Well, I'm sorry to read about your limitations, but if the straight line can't do the job, perhaps a curve can.
There is no point in arguing with the linguists, unless one is a linguist as well. Once a definition appears in the dictionary, such as "Merriam Webster," it should be accepted. Surely, some folks may ask why is it so that there are so many synonyms when these words are virtually identical to each other. Just one word would do, right?
The answer is that they are used as defining terms. For example here is this question: Who are atheists?
If there were no virtually identical synonyms, the answer would be that atheists are people who are atheists, which is an answer that doesn't explain anything.
Here is a brief demonstration of the usage of synonyms, which are words identical or nearly identical to each other by definition. We explain the meaning of the word ATHEIST with the help of synonyms chosen by expert linguists:
http://thesaurus.com/browse/atheist
So let's chose one of those virtually identical synonyms, such as PAGAN and explain that atheists are pagans, or
ATHEIST = PAGAN
But what if the curious person doesn't know what "pagan" exactly means?
No problem. We can find another virtually identical synonym to "pagan" and hope that it would clarify the matter.
By choosing another virtually identical synonym IDOLATER from the list, we can extend the synonym connection to
ATHEIST = PAGAN = IDOLATER
and with the help of a dictionary definition of "idolater," we can explain the meaning of the word "atheist":
http://www.merriam-webster.com/dictionary/idolater
(Say, Dave, whom do you worship? Richard Dawkins? Oh, yeah? Well, he seems to be a very popular pagan god.)
Pagans are often referred to as BARBARIANS
http://mccabism.blogspot.com/2008_07_01_archive.html
So are the communists.
http://glenngreenwald.blogspot.com/2006/11/senchairman-martinez-protests.html
Through the linguistic definition of synonyms ATHEISTS = PAGANS, and through the common usage PAGANS=BARBARIANS=COMMUNISTS, we can safely extend to
ATHEISTS = PAGANS = BARBARIANS = COMMUNISTS
and the proof that ATHEISM = COMMUNISM is complete. Only the religious dogma of atheism can reject the near identity.