I do believe love conquers all, but in the unconditional sense. She cannot compel you to change religion and you cannot compel her to change her mind on the subject if she is not receptive. I think you would be best being honest about your feelings on the matter, but if there is no resolution and you are left with an impasse, then you have incompatible views for a relationship to work. It doesn't mean that you have to stop loving her even if the relationship ends as a result, only that the love will change. There is something to be said for acknowledging when a relationship cannot work and not holding any ill-will, but trying to keep things respectful, even amicable if possible.

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I hope you find a way forward that works for both of you, whether together or apart.