Whether you got converted to Hindu or not, being a foreign citizen, your marriage should have been registered under the provisions of Special marriage act only and not under Hindu marriage act.
Therefore basically the marriage is invalid in India itself.
Secondly, if your marriage was dissolved by a decree of divorce by the USA court on the grounds of cruelty, which is a legally valid ground for divorce in India, then this divorce decree is recognised as valid, hence you do not have to be concerned about the validity in India.
You may have to ensure that the divorce is granted on the grounds of cruelty by the court in USA instead of fault or no fault divorce, which is the usual phenomenon in USA.