Validity of marriage

I'm a christian and my wife a hindu. We got married in 1997 as per hindu rituals and our marriage certificate says ' registered as per hindu marriage act'. However, I was never converted to hinduism. So, will this certificate be valid if I file for a divorce citing adultery? ( I've ample evidence to prove that) Now, in year 2000, my family accepted our union after our child was born. So, my wife got baptized along with my child as a christian and we had a christian wedding in the church and the church has issued a new marriage certified. My question is, which one of the certificate should I produce to proceed with the divorce? Thanking in advance for any guidance.