Proof and Prophecy
Baha'is and Muslims both believe in the Oneness of God, and so it should not be surprising for believers in the oneness of God to see the commonality of many of God's teachings in most religions. All religions came to help us learn about God, and about His Will and Plan. They all came to teach us how to live with one another in peace and brotherhood, and how to better ourselves.
One theme that is common among most religions is the promise of redemption, renewal of religion and salvation, through the coming of a Promised One, to "fill earth with justice as it has been filled with tyranny", (or in Christian terminology, to establish God's Kingdom on earth, as it is in heaven). Each group has called this Promised One by a different name: "Al- Mahdi" (the Guided One), "Al-Qa'im" (the One who Rises), "Sahibul Zaman" (Lord of the Age), Lord of Hosts. Muslims are also promised the return of Jesus (PBUH), as do Christians also await the second coming of Christ. Other religions also await their own Promised One, Whom they know by other different names.
All religions also, warn of false prophets. They warn of the "Dajjal" (the Liar, the one who misguides). They warn of the anti-christ.
So how does one distinguish between the truth and falsehood? Are we left on our own to find out? Would it be better to play it safe and reject all claimants?
What should be obvious is that, the very fact that we are warned of false prophets, should tell us that the True One is surely to come, (albeit it would not be easy to recognize Him). Otherwise, if we weren't admonished to believe in such glad tidings, or if the signs and proofs were to be so clear and obvious, the false ones wouldn't think that they had a chance to impersonate Him falsely. They wouldn't even try, because we would not be expecting anyone to come in the first place.
God says that as long as we make an effort to seek His guidance, His mercy will protect us from being misguided by others:
"And (as for) those who strive hard for Us, We will most certainly guide them in Our ways; and Allah is most surely with the doers of good."
When Christ warned His disciples about false prophets, He (PBUH) also provided them with a criterion to help them distinguish between the truth and the sayings of those false prophets:
"Beware of false prophets ... Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them."
Similarly, we see in the Holy Qur'an:
"Seest thou not to what God likeneth a good word? To a good tree; its root firmly fixed, and its branches reaching unto heaven: yielding its fruit in all seasons."