Gary was binge-watching Marco Polo on Netflix. I was in the room, doing a puzzle on the iPad, because Being In the Room is about all that's left of our Love Languages.
Something Genghis Kahn said ("I welcome Christians and Muslims") launched a debate in our room: Were Christ and Mohammed contemporaries? Gary said yes. My position was that Christ lived about 2017 years ago (ish), and Mohammed was 600 years ago. (A minor point: I am dead wrong on this. His timeline was the year 600, not 600 years ago. Still. Not the point.)
I went to the Internet to back up my claim that Islam started in the year 1400 (again, Not The Point) and that Christianity started in the year 0 (again, ish). I was surfing for facts, Gary kept arguing that both religions started at the same time.
"Ah!" I said, "I was wrong. Mohammed lived in the year 600, so the seventh century."
"So they WERE contemporaries!" Gary crowed.
I looked at him. My face said, "I believe you are very generous with your definition of 'contemporary,' sir."
Gary replied directly to my face. "Yes. If Mohammed was the seventh century, they were contemporaries."
My face got louder. My eyebrows and cheeks and jaw all said, "Whaaaat?"
Gary snorted in derision. "When do you think Jesus lived?"
"When do YOU think Jesus lived? I thought it was 1 A.D." (ish.)
"Hah!" he scoffed.
"No ... dude. A. D. Anno Domini. Year of our Lord. Wait. Are you counting in dog years?"
Finally, I am serious, I made him look up "When Was Jesus Born" on the internet before he would admit that he might have been wrong.