Am I being unreasonable

Okay so I think my family more specifically my grandmother is in denial about my atheism. My family is very religious and into church. My great grandmother church is having service next Friday evening because they are losing a lot of members. A lot of my family is going to support it and my grandma asked me to come. I never cared for church when I did “believe” and I especially don’t want to go now that I’m an atheist. Am I being unreasonable in not going? I want to support my family but I loathe going to church and I don’t want to be preached to. What do y’all think?