A Variation On The Duck Theme

I can't remember which Blogger uses the expression, perhaps he (I'm almost certain it's a "he," and I have an inkling he's a priest) can enlighten me... but it goes something like "If it looks like a duck, and walks like a duck and quacks like a duck, then it is probably safe to assume it is a duck..."

Newhousenewjob put up a link to The Simple and the Ordinary: the author, Christine M has a thoughtful post on what exactly makes someone Catholic... and concludes that it doesn't just mean that you think you're Catholic. If you act contrary to, and think and speak against the basic Truths taught by the Church, then, no matter how you try to convince yourself otherwise, you're no longer a practicing Catholic...