Well you definitely need to know bash as a shell. Maybe not so much bash as a script language, but there is a lot overlap between the two. For example, if you know how to do for loop in bash, you can write a one liner to execute a command in several directories in one shot. That's still more convenient than writing, say, a python script.
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Perhaps a dumb question, but why would you NEED to know bash, wouldn't any scripting language work?
Well you definitely need to know bash as a shell. Maybe not so much bash as a script language, but there is a lot overlap between the two. For example, if you know how to do for loop in bash, you can write a one liner to execute a command in several directories in one shot. That's still more convenient than writing, say, a python script.