Mahalakshmi Viswanathan

Namskarams... i am newbie to this community... i belong to south indian brahmin family(iyer) and married a boy(partial iyengar) my marriage was completely a hindu marriage,but my husband by birth christain and he completely follows hinduism right from birth. we have been married for 5 months and we want our marriage to be registered under "hindu marriage act" how do we convert to hinduism for all official purpose?. his name is not a christain name... so what should we do?