Ummm, no. It EXACTLY argues that atheism is not legit.
It attempts to support that claim by broadening the definition of "faith" to include "all worldviews," but the end result is still claiming that a particular group doesn't REALLY exist.
It's simultaneously insulting and nonsensical.
Imagine if I tried to claim, "Everyone's a vegetarian, even people who eat meat, because what are vegetarians except people who choose what food they put in their bodies? Sure, people have different diets, but everybody eats, and everybody has food preferences, some based on flavor, some based on health, and some based on the morality of how that food is procured, and that's what vegetarianism is REALLY about."
Sounds ridiculous, right? That's because words have not only meanings, but COMPLETE meanings. The above isn't technically false, insofar as vegetarians DO in fact, put a lot of thought into their diet, and yes, everybody does the same thing to some extent. However, the definition is incomplete, because it lacks the small but crucial detail that vegetarians choose their diet with the specific intent of omitting meat. Add that element (yanno, the DEFINING element), and the original premise, that "everyone is a vegetarian," proves to be patently false.
Incomplete definition = incorrect definition.
Re: giving athiests a way to understand theists... that's really not a problem. Athiests spend their entire lives surrounded by theists. Many were raised in one church or another, and many are former theists. We hear religious viewpoints all the time... everywhere. Many of us are closeted and perfectly capable of "passing" as a theist. I've worked in my current job for four years and haven't mentioned my athiesm once, because while my boss is an absolute sweetheart, she's also very religious and, based on what I've gleaned over time, I can pretty much guarantee she's in the "athiests are amoral monsters who are all going to Hell" camp. That's not exactly great for the ol' career path, so I keep my mouth shut, do my job, and once, when I couldn't get out of going, smiled and nodded my way through a freakin' Republican Prayer Breakfast (I'm not Republican, don't pray, and I generally skip breakfast, so... yeah).
I've done a lot of performing over the years, mostly singing, some theatre. Every show I've ever done, working with ostensibly secular groups, they say a group prayer before the performance. Every...single...one.... different countries, different groups. I've yet to find one that skipped that little ritual. And everyone assumes you're fine with it, because THEY'RE fine with it. So you have the choice of sitting out, which will probably lead to questions about your beliefs and likely a religious debate, but you're about to go onstage, and you want to focus. It's not the time or place for arguing, so you just go through the motions and wait for it to be over.
Religion is as omnipresent in an athiest's life as smog in LA. Sometimes there's less, and you can ignore it. Sometimes, when seen from the right angle, it's even kind of pretty. (I can appreciate religious art and music, even if I'm not a member of the faith that produced it). But whether it bothers you or not, it's everywhere and inescapable, and when it gets too thick it's cloying and choking. And if you dare stand up for yourself, even by simply politely excusing yourself from participating, you have to be prepared to defend your position. At best, you'll get people who accept it and move on... at worst, you get people who just can't let it go. I've known people who just refused to drop the subject; literally every time we spoke, they'd try to convert me, or convince me to go to church with them, "just to see that I really would like church, I just haven't found the right one!"
I had one friend who kept trying to bet me money that at some point in my life I'd "find Jesus." I pointed out that it was a stupid bet because there were only two possible outcomes. 1) I'd "find religion" at some point and have to give her money, or 2) I'd die an athiest. There was no scenario under which she would ever have to pay up, and I'd be an idiot to take a bet like that. Also, if her goal in making the bet was to convert me, it was STILL a stupid bet, because in the unlikely event I DID consider becoming religious, knowing I'd have to fork over money if I did would be disincentivising.
She interpreted my careful analysis of how stupid the bet was as a sign that she was wearing me down, and pushed the religious thing even harder after that. Literally every time we hung out, she'd insist on bringing it up, despite the fact that I made it very clear I had no interest in discussing the subject. ...that friendship didn't last.
People become athiests for different reasons, but no athiest I've ever known became an atheist simply because they lacked a proper understanding of theism or religion (not saying none exist, because it takes all kinds, but I've yet to meet someone like that).