Speaking about Islam without knowledge is dangerous.
Islam is divinely revealed by Allah, it is the straight path and leads to Paradise. Islam came to benefit mankind. Therefore as Muslims, we must beware of speaking about the religion without knowledge.
Allah has warned us about this in the Qur’an. He has condemned it.
وَلَا تَقْفُ مَا لَيْسَ لَكَ بِهِۦ عِلْمٌۚ إِنَّ ٱلسَّمْعَ وَٱلْبَصَرَ وَٱلْفُؤَادَ كُلُّ أُو۟لَٰٓئِكَ كَانَ عَنْهُ مَسْـُٔولًا
And do not pursue that of which you have no knowledge. Indeed, the hearing, the sight and the heart – about all those [one] will be questioned.
بَلِ ٱتَّبَعَ ٱلَّذِينَ ظَلَمُوٓا۟ أَهْوَآءَهُم بِغَيْرِ عِلْمٍۖ فَمَن يَهْدِى مَنْ أَضَلَّ ٱللَّهُۖ وَمَا لَهُم مِّن نَّٰصِرِينَ
But those who wrong follow their [own] desires without knowledge. Then who can guide one whom Allah has sent astray? And for them there are no helpers.
وَمِنَ ٱلنَّاسِ مَن يُجَٰدِلُ فِى ٱللَّهِ بِغَيْرِ عِلْمٍ وَيَتَّبِعُ كُلَّ شَيْطَٰنٍ مَّرِيدٍ
And of the people is he who disputes about Allah without knowledge and follows every rebellious devil.
Allah warns against associating partners with Him.
وَجَعَلُوا۟ لِلَّهِ شُرَكَآءَ ٱلْجِنَّ وَخَلَقَهُمْۖ وَخَرَقُوا۟ لَهُۥ بَنِينَ وَبَنَٰتٍۭ بِغَيْرِ عِلْمٍۚ سُبْحَٰنَهُۥ وَتَعَٰلَىٰ عَمَّا يَصِفُونَ
But they have attributed to Allah partners – the jinn, while He has created them – and have fabricated for Him sons and daughters without knowledge. Exalted is He and high above what they describe.
Speaking about Allah without knowledge is indeed telling lies against Him, and there are no lies worse than that.
This goes the same for speaking about the Prophet peace be upon him. We must never fabricate anything against him. He has told us:
Whoever tells a lie against me intentionally, then (surely) let him occupy his seat in Hell-fire.” (Sahih Bukhari 108).
Unfortunately, many Muslims take this lightly. They try to haste to make their own fatwas and have the bizarre and weird interpretations of the Qur’an and Sunnah as if they are scholars.
If a patient were to take medical advice from someone who is not a qualified doctor, it will only be fatal to their health, likewise, those who listen to people who are not qualified in Islamic science and take their fatwas will only destroy their Imaan.
May Allah guide us.