I think what that poster meant to infer was based on core claims for certain religions. Namely that if an omniscient and omnipotent and omni-benevolent deity exists, then it is irrational to imagine that deity would not make every effort to communicate with every human in an unequivocal way, if the consequence were an eternity of torture for those consequently disbelieved the claims of various adherents of different religions.
That is in fact a perfectly reasonable inference. It occurred to Epicurus centuries before Jesus is purported to have said a single word.
Yet, the Bible stories make it clear that God had several ways to get his point across. "You ate the fruit Okay you are hereby cursed." "You people are all evil, and I'm sorry I even created you. I'm going to drown all of you except Noah and his family." "Jonah, go tell the people of Nineveh I'm going to destroy them and their city." Plus, angels appearing. Stopping the Sun for a day. Jesus walking on water, casting out demons and rising from the dead. That God got involved all the time. He wrote on a wall and on a stone tablet. And he spoke a couple of times. And he sent the Holy Spirit to those that believed in Jesus.
But some Baha'is don't think much of those stories. And, ironically, they agree with Atheists that they are fiction. So, the Baha'i concept of God doesn't communicate except through special manifestation every 500-1000 years. Or maybe not, Baha'is still believe in a lesser type of prophet. God could send some of those. And again, some Baha'is were paid a visit by Abdul Baha' himself.
To think that an all-powerful God can't find a way to communicate to everyone? I'm sure he could, but that's not what Baha'is want. They need the people of the world to turn to their guy and his writings as the "only" way to know about God.