For purposes of this thread, let’s act as if God could communicate a direct message to everyone in the world that would convince everyone in the world that God exists. This assumes communication from God that convinces them it is “really God” speaking.
We know that God has never done that because if God had done that everyone in the world would believe that God exists.
For purposes of this thread, let’s assume that God has never communicated a direct message to everyone in the world that would convince everyone in the world that God exists.
Some people believe that God could communicate a direct message to everyone in the world because God is omnipotent. The question I am posing to you is if you think that God would do that, even though God has never done that before?
I am not asking you if God could do that. I am asking you if God would do that.
He will do that, he will testify to the Mahdi universally and everyone will hear it in their own language. This will be one of the signs for the Mahdi when he comes. But you concluding everyone would believe in God is wrong. Satan is a disbeliever in God despite hearing his voice from the barriers of light from God. Despite the exalted ones manifesting God and he followed their glorification of God for years, he disbelieved in them, and all miracles of Prophets and their powers and holy books, has not stopped him from disbelieving.
Similarly, sorcerers often very well understand Quran better then most Muslims, and see Mohammad in the Torah and Gospels, but don't believe but rather many of them work tirelessly to prevent people from understanding so to prevent what in they see would be a misguidance to the masses and believe that Mohammad did miracles as did Jesus, but that it's all sorcery and high level of magic.
You assume everyone will believe, but, the warning of Quran, is even when Jesus descends from the sky (the sign from the sky coming down is obviously an allusion to this in my view), and even if the Mahdi raises many dead people and even if miracles like that of Moses' are shown, unless, people are inclined to love the tree of light and God's pure word, it's likely they will reject.
The reason why God doesn't talk to us, is explained in Quran, we would accuse the Angels or Hidden Guides so much so if we were open a portal to the sky/heaven, and ascended, we would be oppressive to ourselves and the guidance, and say "we are a people who are enchanted" (ie. sorcery is done upon us).
Satan heard God speak, but disbelieve in his Lord, and began to sarcastically talk to Ahlulbayt (as) regarding their Lord when he disbelieved.
Adam (as) even questioned his Lord when Iblis swear by God he was truthful, saying, the God you think is God but is really telling you to not approach the tree of life and light and knowledge, so as not to be one of the exalted ones and one of the abiding ones and to not be one of the highest kings. Look towards them to compete and outstrip them, and you will, so despite God warning him not to look towards Ahlulbayt (as) with envy, he did, and although didn't wish them bad, wished to compete and reach their station. This showed lack of gratitude but he wasn't resolved on rebellion like Iblis, and so when he began to fall, realized the true Lord and repented in all that.
This is while when Michael and Gabriel and Angels under him kicked Iblis out, he didn't repent but asked for respite in which he was given, only for him to then pledge to lead astray almost all humans.
You don't know and no one can feel safe, when Iblis was an Angel close to God for thousands of years, till he fell from grace, all in a moment, all in a moment.