We searched for "Emarti Baptist" in Kajiado county and in Kenya generally, and found no listing for a congregation of that name in church directories or map listings (worldchurches.net, openalfa's Kajiado worship-centre list, Catholic Directory). We did find that Emarti is a place name in Kenya - a town in Narok County (Wikipedia) and a primary school appearing on the Kajiado county map (kajiado.go.ke) - so the name is geographically plausible for a small rural church. A Baptist partner-church register lists Bethlehem Baptist Church in Kajiado led by Samuel Mosoontu at olemosoontu@gmail.com (ebcnairobi.com), a surname matching the contact you supplied, but that is a different church name. Our attempt to confirm a Facebook or other social page returned only unrelated United States churches. Warning: the "website" given is an email address, not a working web address, so no page exists there; we found no scam or fraud reports.
Our conclusion: The entry gives an email address in place of a web address, so there is no page for us to check, and independent searching found no directory or map listing for a congregation called Emarti Baptist in Kajiado County. On the positive side, Emarti is a genuine Kenyan place name, Baptist churches are well established in Kajiado, and a Baptist partner-church register lists a pastor named Mosoontu in Kajiado, which matches the surname in the contact d
We have asked this church for one piece of extra evidence: a photo, a link, its denomination, or a church that can vouch for it. The moment we can verify, this report is upgraded. Without a response, the listing is paused after 14 days.