Why just these seven. And Buddha who did not even say that God exists; and Krishna who said He is the God. Kindly read Mirza own writing, I think he has explained his mission and add it to your line of accepted people. If Allah sent him, you are committing a great sin of denying his message. He is the latest as far as I know. As you say Wikipedia is not the most reliable of source.
I did forget Noah, sorry about that.
I did read some of mirza ghulam ahmad initial biography and I think I'm getting the idea about who is he.
Even though he had good intentions he is basically a person that's still working with the revelation of islam, which is a revelation of old. A brand new legitimate Manifestation of God brings a whole new independent revelation and a new calendar.
The criterias that a person is a true Messenger is:
What do they actually teach? Do they practice what they teach? What prophecies do they fulfill from the scriptures of old?
Another way you know a true Manifestation is that thay come with a new independent revelation and a new calendar, they speak of another that is going to come after them or a return, and if the one who is claiming to be a Prophet still working from an old revelation then they're not a true Manifestation. Another thing to ask is whether ther teachings is mainly based on hate, if they are than they're not a true Messenger.
Some people think that it's always Messengers, that come very often, but the fact is the Messengers are rare individuals that appears around about every 1000 years and that they're always from the east.
I would like to use the analogy of a mature and knowledgeable child and an actual educated adult teacher. While the mature and knowledgeable child may have a big impact on the other children and they feel like they want to follow him that child will still be limited in what he can do because he's still a child and he's not actually been educated. But the actual adult teacher actually have the education to teach the children. So the educated adult teacher will have a far more more impact than the mature and knowledgeable child.
And you have to remember they can't pass just one criteria, thay have to pass all of the criterias and Baha'u'llah does just that.
Another person that you are missing out in the list is Joseph Smith. He had been given golden plates by God. Your list is incomplete.
Now honestly I'm not an historian so I don't know to much about joseph smith or the golden plates. But he doesn't fulfill all of the criterias even though he had good intentions.
We do believe however that joseph smith was a spiritual person that was sensitive to the spiritual currents flowing in the early 19th century.
Tell me a message better than what we Hindus have.
The spiritual message is not better, it's basically the same. It's the up to date social message that different, such as: calling for unity on a planetary level, letting us know that human beings are an ever advancing civilization, the harmony between science and spirituality etc.
As for my being a Hindu and an atheist, I believe in non-duality, Advaita. Each and every particle in this universe is nothing other than a non-God, eternal, form-independent, changeless, un-involved entity which we know as Brahman. Therefore, it makes God imaginary, superfluous and unnecessary9.
Kinda confusing, but I'm listening.