I think we can sum up the response to all that you've typed here, my friend, with Jesus' Words:

"Therefore whoever confesses Me before men, him I will also confess before my Father who is in heaven. But whoever denies Me before men, him I will also deny before my Father who is in heaven." (Matthew 10:32-33)

It's not our job to guess, judge or assume what (todays)Agnostics and Atheists will do/be/believe. The Lord can open anyone's eyes in a moments time. Just as He did with Paul on the Damascus Road. We all are 'guessing' about the time of the 'mark of the beast, and 'when the Lord will return'. The mark of the beast will be given to those 'left behind'. I'm going to be out of here when that time comes!"Even so, Come Lord Jesus."

It's this kind of post that I believe causes much worry, fear, and doubt. All these things our Lord tells us NOT TO DO! We must be careful what we read on the internet. There's much FALSE TEACHING out there. Follow the Bible, not man.