God is not incapable of what you ask, but rather it would be counter-productive. The same reason that a tempting tree was placed in Eden is the same reason that there is degeneration in religions. Why was it placed there? Why was humanity allowed to eat from it? Etc?
The Tower of Babel is the story of the confusion of tongues, when different sects and groups form out of confusion.
So be aware that each one of us is indeed a tower of Babel. And each one of us in a group makes another tower, so, this society in itself is a big tower. Thus, of course, all the groups of this whole humanity form a big city, a big civilization, with a big tower of Babel. This society in this day and age is indeed a big tower of Babel. There is confusion; there is a great confusion in the world. But if we learn how to be meek and to follow our inner Being, we will not be confused.
Master Samael Aun Weor stated:
"It is written that when the Gods want to punish men, first they confuse them." - Gnostic Magic of the Runes
When the Elohim and the Superior Beings want to punish humanity because they are no longer in contact with their own Being, but only following Nimrod, then they confuse them, in order to punish them. Listen, such confusion enters through Nimrod, the personality. Therefore, only those who follow their Inner Being and do not allow to become confused by Nimrod are not punished. - The Tower of Babel lecture
Read that lecture and meditate on all of this.