I don't really agree with that. The plain reading of almost any translation will give you the correct understanding on 99% of the topics in scripture. You don't need to dig into the original languages to be saved, or to live a decent godly life.you can't use any Bible without digging Deep into Hebrew/Greek/Latin for its actual meaning as it is lost in Translations.
Looking into the original languages is important if you want a fully rounded understanding. But even on an issue like polygamy, which is misrepresented slightly in most translations, you can plainly see it's not sin just from a plain reading (if you're honest enough to accept the scriptures instead of man's tradition).
I'm a big fan of looking into the original to get a deeper understanding of everything. But it's not necessary.