at church or in church

[Wesley P]

Hello guys,
Ok, here is my question.
which sentence is correct?

I'm at church watching a mass.
I'm in church watcing a mass.

I already know that in some contexts "in the church" and "at the church" can be used.

Thanks.

 

[2006]

Hello guys,
Ok, here is my question.
which sentence is correct?

I'm at church watching a mass.
I'm in church watcing a mass.

I already know that in some contexts "in the church" and "at the church" can be used.

Thanks.

If you're inside the church, use "in".