2 Thessalonians 2:3
"Now the Spirit expressly says that in latter times some will depart from the faith, giving heed to deceiving spirits and doctrines of demons."
1 Timothy 4:1
The mystery of lawlessness has been taking place for 2000 years and will intensify in these last days; in fact, it is all around us. People's hearts are waxing cold.
"The falling away" is abandoning the true teachings of Yahshua, which for many in religion who profess to be believers in "Jesus," have fallen away from the biblical standard (Torah). They attend church and over time, they have allowed themselves to be shaped by culture and have embraced false doctrines and traditions of men that are rooted in paganism, which YHWH forbids (Deuteronomy 12:29-31). They have twisted and perverted the word of YHWH Elohim.
Why is this important? Because when the man of lawlessness is revealed, he will come out of an environment of lawlessness. Since he will blend right into the culture of religious denominations that have fallen away from the scriptural and moral standards of the bible then he will fit right in with the rest of the world. By condoning lawlessness, it allows the enemy to rise and become THE LAW.
Yahshua never said to follow religion; Judaism, Christianity, etc. He said, "Follow Me." We are to walk in the ways of how Yahshua lived, not according to the traditions and doctrines of men.