Is it plausible that a deity who created life would author or create only one true religion? Why or why not?
Consider that life is remarkably diverse. Everything from bacteria to elephants, algae to roses. How is it plausible that the creator of such diversity could go on to author or create only one true religion?
The true religion would conceivably be charaterised by it's adherence to truth.
Truth is truth, there is no diversity to it. There are underlying principles that exist which cannot be wished away. These are principles which are true under all circumstances and in all places. These principles are the truth.
It also important to note that although there is a diversity of life there is but one God. It this God upholds and embodies truth. And therefore, in a sense, truth is singular. It is one in him. Anyone who receives and follows any principle of truth draws nearer to this one God. And the more truth he learns the nearer he gets. This is true for anyone anywhere in the world. If we all followed the truth which we have received we would all draw nearer to the one God. And it is conceivable that eventually our understanding of God, of goodness, evil etc. would become very similar, even the same - because the truth is the same.
But there are many superficial things in religion - things which are more cultural than anything else. And how truth and true principles are applied may differ depending on circumstances people find themselves. I believe God understands this and works with people of all nations accordingly.