Convert religion ?

Why ?
Is this really necessary ?
If you are in love/in relationship - why convert ? 
It is rediculous that in some interracial relationships the woman has to convert to the guy's religion "eventually" because the children will follow guy's religion; therefore woman will have to convert (not by force but due to circusmatances eventually) /otherwise being left out - I.e. Does not fit in the culture.
🙄
(Muslim SO and White Woman - for example )