Then the method of delivering messages is flawed.
Because the majority don't get any message and many who do reject it. Or there is no message just people thinking they are getting something.
The method is not flawed just because the majority do not get the message in the first centuries.
There are many reasons why few people get the message in the beginning and all of them are related to humans, NONE of them are God's fault at all.
Here are the main reasons more people have not become Baha'is to date:
1. Many people have never heard of the Baha’i Faith, so they do not know there is something to look for. It is the responsibility of the Baha’is to get the message out, so if that is not happening, the Baha’is are to blame. However, there are so few Baha’is and they are busy building the New World Order, and there is only so much time, so they can only do so much.
2. But even after people know about the Baha’i Faith, most people are not even willing to look the evidence in order to determine if it is true or not.
3. Even if they are willing to look at the evidence, there is a lot of prejudice before even getting out the door to look at the evidence.
4. 84% of people in the world already have a religion and they are happy with their religion so they have no interest in a “new religion.”
5. The rest of the world’s population is agnostics or atheists or believers who are prejudiced against all religion.
6. Agnostics or atheists and atheists and believers who have no religion either do not believe that God communicates via Messengers or they find fault with the Messenger, Baha’u’llah.
7. Baha’u’llah brought new teachings and laws that are very different from the older religions so many people are suspicious of those teachings and/or don’t like the laws because some laws require them to give things up that they like doing.