First, let's discuss what is "correct" in what you wrote: Ecclesia or ekklesia is indeed the underlying Greek word for "church" in the New Testament and it simply means "called-out ones"...therefore, the emphasis is on the church being flesh-and-blood, NOT a brick-and-mortar building!
And it's unfortunate that the latter has overtaken the former in Western culture (and parts of Eastern culture as well).
As for your claim that this word "church" was a creation in the 1630s by the KJ translators...well...you either didn't take very good notes from whatever "sermon" or "message" you heard that from...or, you've been fed a falsehood that you swallowed whole.
Now at this point I won't go through the entire etymology of the word, "church" -- but just to show you how wrong you are...John Wycliffe was part of a pre-reformation movement in Britain in the late 14th century. He encouraged his followers to translate Jerome's Vulgate version of the Bible into Middle English, which they accomplished between 1382-1395 -- so that was 216 years before the King James translators finished their version (1611).
Wycliffe's Bible version is online. You can see it here: Wycliffe version.
As an example of his use of the word "church," you can go here to Eph. 1:22 where you will see the Middle English spelling version, chirche: Effesies [Ephesians]
So, if your memory was "off" -- well, that "happens." But...But...But...if somebody fed you the line that the KJ translators "made it up," then you need to take that falsehood and run it right back up the line where you heard it from...And ask them why they are exporting falsehoods. (And at the same time, ask them what other tall tales were told in the name of "truth").
What an officious falsehood you propound. “Church” etymology, as you well know ,but do not wish to reveal ,is from the pagan concept of “circe” (from circa 900) or “kirke” (circa 1500) referring to the pagan practice of sitting in a circle and worshiping rocks. King James noticed that the practice gave control over the attendees, while Ekklesia gave him no control. The Catholic monarchy was quite ready for the change as well. Every time you see “Church” in the Bible (154 times) ,know that it was a ploy to herd idiots and should be translated “ALL BELIEVERS IN JESUS AS THE SON OF GOD!!” http://antinomianism-salvation.blogspot.com/
We agree on something! Well done.