Mat 6:5-6 is talking about prayer, not congregation. He's also talking about the reason that these hypocrites are praying, not where they're praying. By the logic propsed on this site, Christ also says YOU must NOT go to street corners as well.
Manifest absurdity.
JFB has this to say on the subject:
"Compare Rev_2:14, Rev_2:15, which shows the true sense of Nicolaitanes; they are not a sect, but professing Christians who, like Balaam of old. tried to introduce into the Church a false freedom, that is, licentiousness; "
As the author of this document clearly has a proclivity for. This whole theology is riddled with claims lacking any scriptural basis.
Also, if you
take the word CONIFER, which
is the name given to the family of
trees to which the Christmas (Fir) tree
belongs, and split the word in
two, you get:
CON-IFER
CON - Satan is known as the biggest
con-artist
ever. He invented
it.
IFER - The last half of Lucifer's
name.
HE'S LAUGHING AT ALL OF US RIGHT
NOW!
This kind of nonsequitor is actually very common in the church at large, and I'm not surprised to find it here. As though the english word for a tree was somehow a mockery for Satan's masterminding the remembrance of the very birth of Jesus Christ.
Not to mention that the connection itself is flimsy at best. The author would have done better to simply keep quiet than make such claims.