I do not believe that the Slavic church is the church where Tyler's family attends. I found out that an East Indian family that I know goes to church with Tyler's family. (This connection was made after Tyler went missing). Although I don't know the exact name of the church where the Indian family goes to, I feel pretty confident that it is not the Slavic church. I can't imagine why an Indian family would go there, or that they would be overly welcomed. So if they don't go there, then neither does Tyler's family.
Another thing that leads me to believe Tyler's family attends elsewhere is that in her original post on Facebook, Tyler's sister referred to it as a "Russian youth group" rather than "our church's youth group" or "Tyler's youth group."
Having grown up in church my whole life, I know that it is very common for teenagers to invite and bring friends along with them to church activities. Some of these friends might even start attending events every week, especially if their family does not go to church regularly or if their family's church is small and maybe doesn't have an active youth group. However, with this particular church being specified as a "Russian" church, I did find it a little odd that Tyler would attend there, even as an infrequent visitor. In my experience, a lot of times those type of churches do not have services in English! (But perhaps the youth events do?). Also, we have been told by the media that Tyler was committed to his church. HIS church, not the Slavic church, so, that also makes it seem odd that he would go somewhere else at all.
The only time I ever knew of a non-Slavic teen hanging out at a Slavic church was a young man who was very interested in dating a Slavic girl. From what I gathered, the guy wasn't overly welcomed and his presence wasn't overly appreciated. Of course, I am not saying this was the same in Tyler's case. It's very possible he just had some good friends at the Slavic church and they invited him to fun youth activities. It makes sense that a 16 year old would want to go hang out with friends, at church or wherever! But I do think it would be interesting to know what the connection was. If it happened to involve a romantic relationship, that would seem like something LE would definitely want to look into.