You should get spiritual not because your girlfriend wants you to be, but because you need to get close to God. Being spiritual is a state of having a relationship with God which include talking and communicating with your creator, it means walking with God and understanding that you should obey Him. It is absolute dependency on God and abstaining from all kinds of evil. Once you have a relationship with God, you would not need to convince your girlfriend that you are now spiritual, she would see it in you.
Wish you well,
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