Maybe God is just smarter than you and has a purpose for it that you don't understand. I see this mindset from atheists time and time again, that if God doesn't do things the way they would do it, then he must not exist. It's not really much of an argument. I don't think it is God's intention to communicate clearly to everyone. The bible mentions that God didn't want his gospel to be spread to certain parts of the world at certain times, so it's no surprise that he might allow something like language to prevent certain things. Sometimes he lets people fall into their own pits which they dig for themselves to demonstrate the destructiveness of sin, and sometimes he lifts them up to demonstrate his grace. Who are we to tell him how he ought to behave? It is not as if we are entitled to anything from God, he gives what he will to whom he will with no obligation. If we are all sinners worthy of God's punishment, then anything less than the full punishment due is actually a form of mercy, and if he wants to give his gospel to some, then that is his prerogative to be gracious and show unmerited favor where he will.