I cant believe my friends mom rn.

So im a christian. My friends lil sis was asking me questions about it and told me she wanted to be christian. I gave her a kids bible and encouraged her to read it. Well a few mins ago, i was hanging out with my friends lil sis. her dad was staring at me through the window. i asked my friends why and she said it was because of the kids bible. 

My friends mom doesnt trust me anymore because i encouraged christianity. Now whenever we hang out, a adult has to watch us…

i dont even want to go over there anymore. 

Any advice on what to do?