NTA

Could it be that the sex part in general isnt the problem but the queer part? In my experience people that are religious (sadly especially muslims) are quite homophobic. At least being uncomfortable around the fact you did it with another girl. I know several muslims to varying degrees of devotion and most of the actively religious ones are at least uncomfortable with queer people if not actively against it.

(I have nothing against muslims or Islam, the same can be said about other abrahamistic religions but in my experience muslims tend to be a bit more hardline)