Hi, Paul!
I had been very active in the Christian Church right up until I encountered the Baha'i Faith.
What convinced me was extensive reading, prayer, investigation, research, and observation, continuing for a number of months.
At the end of all this, I found myself--still not a Baha'i--telling others "This is really neat: you should check it out!" I finally said "This is ridiculous!" and enrolled.
And in the over 34 1/2 years since then, I have NOT ONCE had any reason to regret this decision!
As to your other question, the Bab (which means "Gate") was the forerunner, and a Divine Messenger in His own right; He founded the Babi Faith.
From it sprang the Baha'i Faith, whose Founder is Baha'u'llah (meaning "Glory of God").
Before His death, Baha'u'llah appointed his eldest son, 'Abdu'l-Baha (a self-imposed title meaning "Servant of the Glory") as His successor and the interpreter of the Baha'i scriptures.
The Baha'i scriptures were written by these three individuals and amount to approximately 200 volumes! You can see these (and more!) at
www.reference.bahai.org and
www.bahai-library.org.
Regards, and do keep the questions coming: they're most welcome!
Bruce