ANSWER:

Are you sure he is not a Muslim? Why would a Christian priest do such a thing? Anyhow, there is nothing wrong in praying in such a masjid but the muslims must take care of running it. 

There is a Mosque in our area which is called as PETER MOSQUE. On inquiring, I found that it is funded 100% by a Christian Priest. He got the construction done, furnishing etc. He even appointed the Imam & the Muezzin also. This priest is also taking care of monthly expenses as well Q is: Can v pray in such a Mosque?

Rulings on mosques | September 7, 2019 6:04 am
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In Dawah work of ladies circle many women bring children from 1 yr old to 7 yrs old and many children are disturbing and not well behaved.Is is wrong to tell the mothers not to bring them or guide them?They reply that Prophet s.a.w told let children come and his grandsons would come too to mosque etc.what is right?
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Is it permissible to allow women to perform ju-mah and other salah inside masjid.we are sunni from south india;here some sunni masjid are not allowing women inside masjid ;even the women are not in periods;and they are saying hadith that “for women it is better to perform salah in home. So kindly say ruling about it.