But you stated that god makes it difficult to recognise a messenger.
And by the words we have of these supposed "messengers", it is difficult to know who God is. God is not necessarily one. There could be multiple Gods. Then what do we know about these "messengers"? If we go by what is written about them do we really "know" them? Then we get to what is written about how to recognize them when they return, except, even if it is supposed to be them, it really means someone different. We're given contradictory times and places about the return. We are told contradictory things that will happen before and after the return. Then, for the Baha'is to be correct, there has to be two "messenger/manifestations" prophesied to come in these supposed "last days". How do we evaluate all of that?
Right off the bat, Baha'is can't show that God really exists. The best proof is messengers. But what "proof" is that when all the things we have in the Scriptures about them contradicts the other messengers? Ah, but the Baha'is have a way to explain why there are apparent contradictions... The Scriptures weren't written by the messenger himself. So, the writers might have gotten things wrong. Then the leader of the religion misinterpreted them. So, by the time we're finished, the religion can't be trusted to be telling us the truth. But, lucky for us, the Baha'i prophet tells us what that truth was. And what a surprise... It points straight to him as being the Promised One of every single religion... That is every single "true" religion, and again, he tells us which ones those are. Sure, very believable.
But those of us that have our doubts, then question the things he said... especially the laws he brought, that supposedly came from God. Gays have something wrong with them and need therapy. Tattoo thieves and burn arsons. I don't know? Maybe that sounded like God in the 1800's, but now? I agree, barbaric. The Baha'i enforcers are going to tie a person to a stake and burn the person alive? And the thieves? I wonder if giving them a tattoo includes white-collar or religious thieves?
But then the plan for world peace. All the nations should disarm... almost. They can keep a few weapons to maintain order within their borders. Why? I thought everyone was going to love one another and live in peace? So, why the need for borders? Then, with their few weapons, all the nations are supposed to unite and put down any rogue nation that tries to take over. And I suppose that rogue nation got rid of most all of their weapons too? Yeah right, suppose they hid a few weapons of mass-destruction. They could hold the rest of the world hostage to their demands. Oh, but even in the U.S. lots of ordinary citizens won't disarm. And God expects the nations to disarm?
Baha'u'llah says he has the answers to solve the problems of the world. We can look at them and evaluate them. Will they work? Do they sound like they are from God? If God knew what it would take all along, why put humanity through all the wars and turmoil over the centuries just to get to this point? He couldn't have released the spiritual power needed to get people to love one another and to live in peace while they still had only bows and arrows? Given the track record of all the other religions, I remain skeptical that the Baha'i Faith will work... and is even for real.