This study examines associations between dimensions of religiosity/spirituality (R/S) and anxiety symptoms in mothers of children with autism spectrum disorder (ASD). Mothers' positive ways of thinking and romantic relationship satisfaction were examined as mediators of associations. The extent to which child ASD symptom severity and maternal broad autism phenotype (BAP) behaviors predicted interactions with religious community members was also examined. Seventy-three Christian mothers of a child with ASD completed online surveys. Higher levels of spirituality were associated with viewing their child with ASD as providing a positive contribution to the family. These positive views were, in turn, associated with less anxiety symptoms. Mothers of children with more severe ASD symptoms also reported greater negative interactions with members of their congregation.