In “Audacity of Hope” he claims explicitly he was baptised, in a curious, passive voice passage notable for it lack of detail.
Given that, as you say, UCC does not mandate baptism for membership, it is quite likely that the ceremony was more like an altar call than a traditional water baptism by immersion or infusion. It is also most likely that the church would not keep special records of any baptism ceremony, if one did occur, only noting that he enrolled as a congregant on a particular date.
Thanks, I didn’t know that. I’ve read a number of key or controversial passages cited from his books, but I haven’t had the patience to sit down and read them, and I would never buy them and help put money in his pockets. (Similarly, I didn’t have to read “Mein Kampf” to know I didn’t like Hitler. A few extracts were enough, and I didn’t want to make myself sick.)