Miracles in Quran

You know that there are many scientific miracles in Quran and i know one scientist came to İslam due to this, but there are many channels( the most popular is Apostate Prophet) that says that miracles are debunked, after that İ listened one of them (this is a Christian channel) with says that this miracles was known by Ancient greek philosophers, it confused me but not really ( just how can a non-literate person(s.a.v) can achieve that much information as an bedouin(s.a.v)? what he(s.a.v) know Ancient greek??) Any throughs?