I'm not a scholar and I don't want to offend anyone, but I have questions that I can't find a calm answer to. For example, if God is all-powerful and good, why is there so much terrible suffering in the world? Children get sick and die, animals suffer, natural disasters happen. If God can do anything and loves everyone, why does he allow this? People tell me it's a test, but for a small child it doesn't look like a test.
Another thing that bothers me is that faith depends so much on where a person was born. If I was born in a Muslim country, I'm probably Muslim. If in India, Hindu. If in Europe, Christian or atheist. If there is one truth, why is it so tied to birthplace? It looks more like a cultural tradition than something obvious to everyone.
There are also questions about the Quran itself. I'm told it's the unchanging word of God, but historians write that there were different readings, that the text was collected and standardized under Uthman, that there are traces of editing. If the text is truly uncreated and perfect, why does it have such a human history? And why are many stories in the Quran similar to earlier Jewish and Christian texts, sometimes even apocrypha? This doesn't necessarily destroy everything, but the questions remain.
I'm also bothered by some moral points. In the texts there is slavery, military commands, inequality of women in testimony and law, punishments for apostasy and adultery, the story of Aisha's age. People tell me this must be understood in the context of that time. But if morality from God is eternal, why does it change so much with history? It seems that either morality is not absolute, or we are not reading it the way we should.
There is also abrogation of verses. Some verses cancel others. If the message is eternal, why is it corrected according to circumstances? It looks like people changing rules as they go. And also: how do you distinguish a true prophet from a charismatic person? They say the Quran is inimitable, but that's subjective. Other religions also have miracles and personal experience. You need some independent way to check, but there isn't one.
Finally, some places in the Quran about seven heavens, a spread-out earth, the sun setting in a murky spring, don't fit well with science if read literally. And if read metaphorically, then you can explain anything, and nothing can be checked anymore. I'm not saying I have a final answer. But all these questions together create serious doubt. I think an honest believer should also notice them and somehow respond to them.