Who are you to say what Barack's and his families' religious beliefs are and are not?  He covers them in his autobiographies, and Newsweek did an extensive spiritual background check on both McCain and Barack during the campaign.

NPR also covered the topic rather extensively.

It's awfully convenient to claim that Barack only became a Christian to run for political office, when his spirituality comes from a courageous period of doubt, questioning, and eventually finding his own relationship with Jesus - all before running for any level of office.

That, BTW, mirrors my own journey, and yes, I am a liberal.  To truly follow the teachings of Christ, especially concerning the poor, requires a liberal leaning.  I am proud of both my faith and my political outlook.