“I’m venturing most Romam Catholics attend services once a week and engage in no other Bible study.”
Probably half attend weekly at best.
In some countries, +80% of listed members never attend during a year.
Further in the article they suggest that around 3.3% attend more than once a week but don't specify how many times per week.
http://nineteensixty-four.blogspot.com/2009/09/nuances-of-accurately-measuring-mass.html
And for the poster who likes to cite the "famous" people who've converted to Roman Catholicism they would be sobered to note there are 30.1m adults who no longer identify as Roman Catholic through 2016.
So?
There are thousands of PROTS like that as well.
Oh, occasionally some TRAMUA!!! will happen in their life and they'll FLOCK to the church for a while until it the bad thing goes away.
Then revert to a C&E 'christian'.
And then back to not darkening the doors again.