And where does the ekklesia base its teaching? Scripture.
The appeal to "it is written" and the written word is more than adequately testified to in Scripture.
When Jesus was refuting Satan to what did He appeal to? Scripture.
If Scripture is sufficient for Him it's sufficient for us.
Really?
Show me where the Scripture tells you being "born again" is "literal," but eating His Flesh, and drinking His Blood, which is mentioned more times, is "spiritual?"
Show where Scripture tells you "Do 'THIS'" is not literal and the main point, rather than "in remembrance of Me?"