Miracles can only do so much...
Then deception will have to take over from there...
Matthew 24:24
For false messiahs and false prophets will appear and perform great signs and wonders to deceive, if possible, even the elect.
John 4:48
"Unless you people see signs and wonders," Jesus told him, "you will never believe."
Revelation 13:14
Because of the signs it was given power to perform on behalf of the first beast, it deceived the inhabitants of the earth.