Actually a great programmer will figure C++ out fast enough for most purposes. Templates are weird and hard, but a great programmer can figure them out. However if you don't have a several years of experience you will make mistakes, so I can't hire you as the next go-to expert in the difficult corner cases of C++ that sometimes we can't avoid (though as we move to modern c++14 there are a lot less of them)
If you lie on your resume and I catch you that is an important red flag because I no longer no what else I can trust you on.