All I can speak for is my geographic area. SBC church membership(attendance I should say) is in huge decline. The non denominational Mega church and Andy Stanley's Church are the only ones showing any significant growth. (I honestly can't say for sure if Andy is SBC or not. If he is, he sure ain't typical.)Or are they cleaning up their membership list which may have members who left the church (or passed away) over the past 30-40 years - let alone 1-29 years!
Just looked at our membership list - 29 active members - regular attendance is about 15 - and at least 1/3 of the current attendees are not members.
Most of the SBC churches are showing significant decline.