Absolutely, there is a verse in the Qur'an that shows how much free speech is allowed as opposed to the mainstream thinking :

﴿ ۞ لَتُبْلَوُنَّ فِي أَمْوَالِكُمْ وَأَنفُسِكُمْ وَلَتَسْمَعُنَّ مِنَ الَّذِينَ أُوتُوا الْكِتَابَ مِن قَبْلِكُمْ وَمِنَ الَّذِينَ أَشْرَكُوا أَذًى كَثِيرًا ۚ وَإِن تَصْبِرُوا وَتَتَّقُوا فَإِنَّ ذَٰلِكَ مِنْ عَزْمِ الْأُمُورِ﴾

You ˹believers˺ will surely be tested in your wealth and yourselves, and you will certainly hear many hurtful words from those who were given the Scripture before you and ˹from˺ the polytheists. But if you are patient and mindful ˹of Allah˺—surely this is a resolve to aspire to.

A few verses before that showing how they talk about God:

Family of Imran (3:181)

لَّقَدْ سَمِعَ ٱللَّهُ قَوْلَ ٱلَّذِينَ قَالُوٓا۟ إِنَّ ٱللَّهَ فَقِيرٌۭ وَنَحْنُ أَغْنِيَآءُ ۘ سَنَكْتُبُ مَا قَالُوا۟ وَقَتْلَهُمُ ٱلْأَنۢبِيَآءَ بِغَيْرِ حَقٍّۢ وَنَقُولُ ذُوقُوا۟ عَذَابَ ٱلْحَرِيقِ ١٨١

Indeed, Allah has heard those ˹among the Jews˺ who said, “Allah is poor; we are rich!” We have certainly recorded their slurs and their killing of prophets unjustly. Then We will say, “Taste the torment of burning!

— Dr. Mustafa Khattab, The Clear Quran

Also when they say that God's hands are chained.

Glory be to God above what they describe.

And the one who called the prophet pbuh unjust, he effectively became non Muslim and wasn't punished for leaving islam, also the ones who used to insult the prophet pbuh (while some weren't as brave and they would insult Ali to hurt the prophet pbuh) without punishment since that's their right and they'll be punished in the afterlife not our right to punish them and it would be aggression.