Do Bahai's endorse radical ideology similar to the radical Islamists? I don't know too much about them.
All religions have Hardline/radical believers.
Islam, Christianity, Judaism, Bahaiis, Zarathusti and even Hindus have radical believers.
Radicalism should be banned not the religions.
Forgot one thing to say:
It is not the religion which makes people radical. It is the people who read Koran or Bible but try to have a radical definition of what they read.
Religions can be interpreted in moderate ways or Radical ways. It is up to us who/how to be!