A.W. Pink
This is from the White Raiment blog:
“Be ye not unequally yoked together.”
“This applies first to our religious or ecclesiastical connections. How many Christians are members of so-called ‘churches,’ where much is going on which they know is at direct variance with the Word of God—either the teaching from the pulpit, the worldly attractions used to draw the ungodly, and the worldly methods employed to finance it or the constant receiving into its membership of those who give no evidence of having been born again. Believers in Christ who remain in such ‘churches’ (?) are dishonoring their Lord. Should they answer: ‘Practically all the churches are the same, and were we to resign, what could we do? We must go somewhere on Sundays,’ such language would show they are putting their own interests before the glory of Christ. Better stay at home and read God’s Word, than fellowship that which His Word condemns.”
—A. W. Pink (1886-1952)
The Road 
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Very interesting…I tend to think of this situation as being recent, or modern-day, yet this was penned before 1952!
Thanks for sharing it!
Dunamis: For a Christian to live in the world system, it is a constant battle. That is why Christians are soldiers: we are always fighting against the devil and the world system. I am sure that since the first century wolves have tried to enter the flock through false doctrine—especially after the apostles were eventually killed off.
Here is something that was written in England back in the 1600s:
“Mary Howgill Warning the People of England, 1660”
https://hitchhikeamerica.wordpress.com/2013/02/02/mary-howgill-warning-the-people-of-england-1660/