Politics and religion

I watched from my home in UK Mr. George Hargreave on Revelation TV channel at 2.30pm on Sunday 02 November 2008. He is the President of Christian Peoples Party which is a registered as a political party in the United Kingdom. The leader was explaining how his political party being a party having faith in Gospel, Trinity and Jesus could still ask for votes from people from all religions and faiths. He also mentioned that as Christianity was based in the belief of God and service of mankind, it should apply to all humanity in UK.
I wonder what is the logic behind banning religious political parties from being registered in Bangladesh. I personally do no endorse the Jamaat's role during the liberation war but if they openly shun their anti-liberation stand and apologise to the nation and offer their pledge for the security of the nation against any foreign power and also bring their own anti-war criminals to question, I will also support the right of the Jamaat to freely preach their political beliefs and to participate in elections. None should be ridiculed for apologising for mistakes as that hinders the way for reconciliation.
Any ideology, if suppressed, it is human nature to grow more curious about it and that opens up doors for preaching of misconceptions against it and even by it. There are innumerable political parties in the West which are based on their religious beliefs.