"For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear. They will turn their ears away from the truth and turn aside to myths." 2 Timothy 4:3-4
"At that time many will turn away from the faith and will betray and hate each other, and many false prophets will appear and deceive many people." Matthew 24:10-11
"For false Christs and false prophets will appear and perform great signs and miracles to deceive even the elect-- if that were possible. See, I have told you ahead of time." Matthew 24:24-25
"See to it that no one takes you captive through hollow and deceptive philosophy, which depends on human tradition and the basic principles of this world rather than on Christ."Colossians 2:8
"For if someone comes to you and preaches a Jesus other than the Jesus we preached, or if you receive a different spirit from the one you received, or a different gospel from the one you accepted, you put up with it easily enough...For such men are false apostles, deceitful workmen, masquerading as apostles of Christ." 2 Corinthians 11:4,13
"But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them-- bringing swift destruction on themselves." 2 Peter 2:1
Jesus answered: "Watch out that no one deceives you. For many will come in my name, claiming, 'I am the Christ,' and will deceive many. Matthew 24:4-5
The Great Deception will be accompanied by the Great Falling Away - which began some time ago.
And it will get even worse before the Rapture.