... when I was a little boy, my mother took me to a neighborhood Presbyterian church and left me with the other children while she did whatever it is that the adults do there. The only memory I have of the event is walking in the front doors. But at the end of the service, they told her "don't bring him back here."
Probably the luckiest moment in my life.
Out of curiosity I googled "presbyterian buddhist" and came across this
. Kind of a muddle, but interesting.
Back to the topic ... I would speculate that a sotapanna who takes rebirth as a human would eventually notice unusual things about himself or herself, such as an inability to tell a lie, a strange compulsion not to swat at and kill mosquitoes or other living things, an overwhelming motivation not to try alcohol ever, and perhaps a natural inclination toward meditative absorption. I would speculate that a sotapanna generally would be a very happy, content individual whose kamma has brought him or her to rebirth in a setting conducive to a calm, peaceful existence. But if not, then I imagine those ordinary people who are close to the sotapanna would notice something different about him or her compared with others.