To understand Islam properly needs an understanding of Arabic so the Quran can be appreciated in its original transcribed language, which even when translated into English has parts that soar in terms of poetic language.
Other than that I don't approve of Abrahamic religions at all and in principle I can pick holes in Buddhism and Hindusim too. I like to pick the good bits out of all of them but I reserve the most disapproval for the Abrahamic religions.
That's Islam, Christianity (the one with the largest body count around the planet) and Judaism. All space cults.