Jesus standing at the door and knocking is not an evangelistic outreach, but a tender picture of his care for the church by calling her to repent of blending in with a godless culture.
On Jesus Standing at the Door & Knocking
What is the mark of the beast?
Rather than get worked up by dubiously trying to identify the mark of the beast, we would do well to recognize that Christians have always had to choose fidelity to Christ over the world.
Making and Maturing 