Near the corner of Westchester Avenue and Pugsley Street in Parkchester, just off the elevated tracks of the No. 6 train, Yaakov Wayne Baumann stood outside a graffiti-covered storefront on a chilly Saturday morning. Suited up in a black overcoat with a matching wide-brimmed black fedora, the thickly bearded 42-year-old chatted with elderly congregants as they entered the building for Shabbat service. The only unusual detail: This synagogue is a mosque.