No,
Certification gives recruiter only an indicator about your specialization which should not affect your credibility untill and unless you have considered the certification as a tool to climb the corporate ladder.
Any certification would help you to follow a systematic approach to achieve the very purpose of certification .In our case ,purpose is to solve the problem.
Even today,80% of process problems are resolved by people who don’t have any understanding of Six Sigma tools but there approach follows the lean philosophy.
Out country is not yet ready to embrace the lean philosophy as an important identity of any success but our basic core is full of it and we have been practicing it for a very long time.
I have implemented various successful projects not by deploying six sigma tools on to the ground (as that is gibberish to floor people) but by embedding lean philosophy in their work culture.
To conclude ,even with the Black Belt certification I have never got a chance to implement a complete black belt project ,however I am able to develop the lean philosophy by understanding the actual need to solve the problem.