Sounds like reports of asking about Jewish status might be fog of imagination or he was not wanting to shoot Jews...
Many reported that he asked people if they were Jewish before firing and that he made antisemitic comments and/or yelled “Heil Hitler!” He most likely is not Jewish.
The article behind the last link that I posted said that the two Methodist victims were a daughter and her father. The article behind the following says that they were grandson and grandfather. Journalism is really messed up now because of university and hiring policies over the past three decades.
http://www.kansascity.com/news/local/community/joco-913/