Hahaha ,I may be a liar on few occasions , you are certainly an arrogant fool .Your post on this threads reek BS .
Back to Topic.
Civil marriage codes not only resister marriages under it , but also deal with disputes related marriage such as monogamy/pogamy , Divorce , property right , inheritance etc.
While muslim personal laws and divorce acts of christian comprehensively dealt with issue such as annulment of marriage and maintenance of wife thereafter ,
no dharmic religion including sikhs marriage called Anand Karaj has no concept of divorce in it ,since marriage in dharmic religions were/are supposed last seven births.
Anyway therefore there was need to standardize all aspects related to personal laws of dharmic groups and to address that comprehensive bills were created such as Hindu marriage act etc as part of Hindu personal laws.
your problem lies only the name ,/b] then i can't help it expect that you should remember not only sikhs , but Buddhist, Jains, animist etc also comes under the Hindu marriage act .