Is Islam the perfect religion?

1. As the title suggests, do Muslims believe that Islam as a religion is perfect? 2. Is the Quran a perfect religious text? 3. And were the actions of Prophet Muhammad perfect(PBUH) perfect as well? 4. Also, if that is the case, how exactly is perfection defined? Does wide misinterpretation count as imperfection? Or being impractical count as an imperfection? If at all, it is impractical or misinterpreted. Sorry, for clubbing so many questions but they are closely related.