You can go to as many religious ceremonies as you like provided it wasn’t a legal ceremony.
The majority of Roman Catholic and Protestant church religious services are also legal ceremonies.
The majority of Muslim ceremonies are not legal ceremonies but purely religious.
If this was a legal ceremony and not just a religious ceremony, then your husband commits bigamy if he is not divorced.
It depends therefore the nature of the service that you went through. The chances are that it wasn’t a legal ceremony because the majority of mosques are not licensed for legal ceremonies. However, if that’s the case, you would also not be legally recognised for benefits and other purposes as a spouse.
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Just because it was in a premises which were licensed doesn’t necessarily mean that it was a legal ceremony.
You would need to ask whoever carried out the ceremony whether it was simply a Nikkah or it was also done to comply with the legal requirements of marriage.
It is absolutely impossible for me to say which ceremony they carried out.
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