Yeah Christian girl will want their partner to be a christian also because there is a verse in the bible which talk about being the same yoke (religion).

To be specific:

"Do not be unequally yoked with unbelievers. For what partnership has righteousness with lawlessness? Or what fellowship has light with darkness? What accord has Christ with Belial? Or what portion does a believer share with an unbeliever? What agreement has the temple of the living God with idols? For we are the temple of the living God; as God said, 'I will make dwelling among them and walk among them, and I will be their God, and they shall be my people. Therefore, go out from their midst, and be separate from them, says the Lord, and touch no unclean thing; then I will welcome you, and I will be a father to you, and you shall be sons and daughters to me, says the Lord Almighty'." 2 Cor. 6:14-18, ESV

I believe those Christians that are very strong faith or fanatic will be like that... Because in the bible they were told to always put God first in everything...

Some people want to have church wedding.

I think most church nowadays need you both to be Christian and also member in order to use their premises.