I would like to know more about what you mean by posting non religious things. What do you consider to be non religious things?

Very carefully. I smile a lot.

Whilst my family wish that I shared their belief, they begrudgingly respect my non beleif enough not to force it on me. So long as they don't do that you shouldn't have a problem. is it something that they try to force on you?

Yes, and to be honest I troll them a little. When my grandfather was alive I would respect him by being quiet during grace at large family gatherings, because I was so close to him, but it was always nice to not have my head lowered and meet the eyes of one or two other family members who were doing the same.