Is it true that a mosque has replaced the church at Old World Village?

No. Fake News.

No its not

I remember the church, but can't say if it's a mosque. I will check it out.

I think the church is there I didn't see a mosque and I went this past June

Yes, the Catholic church has been replaced by a mosque. I have been inside and worshiped there. Pacifica Institute host many of your annual celebrations in the church basement. Fabulous food.