As I read through this thread, I immediately thought of those when TSHTF( /during /after) who come to believe. I don't believe they'll run to the first church building to get baptised but rather the believers will be ministering and fellowshipping as in the Book of Acts, not in a building or organized institution but in homes or by the riverbank as described in the Scriptures.

Frankly, as many have said here some of us are already doing so.

His Spirit will lead and instruct us as we abide in Him and He in us. His Word says so. :)