I doubt that system would handle future 4K livestreaming well. Maybe, others will have to comment.
Also, you don't mention if you are dual streaming direct from OBS, whether using same or different stream settings (ie higher resolution for YouTube) or using restream.io or similar? And for church setting, consolidated online comments for livestream builds community, so as much as I detest Facebook (and similar social media) for security reasons, I set up our church to use Facebook's Scheduled Live Video streams, so non-FB users can watch as well. But I do understand there are other use cases/scenarios where House of Worship dual streaming may make sense
See my prior posts on PC setup, and what I did for our church livestream system for my feedback, details, budget etc. I wanted a system with at least 4 years life, with next business day onsite support, and good phone tech support if I'm no longer around to support the system myself. I also wanted a system that would record our livestreams and then be able to edit those videos. So a 2nd HDD for archiving video is appropriate
So I consider a 6c/12t CPU to be a minimum... yes it is overkill today... but it won't be in a few years and I know this system won't get replaced in 3 years, so spending a little more know will save in the long run. I also avoid consumer systems for same reason. Assuming 720p/1080p stream resolution today, a decent system as you spec'ed would be fine. But longer term, adding a nVidia GTX 1650 Super (Turing) or higher/better will help with GPU encode offload. With current GPU prices, holding off on GPU purchase might make sense (as long as funds assured to still be available when GPU prices get back to reasonable).
And then realize that regardless of video, what is most important is the audio quality, so make sure you consider your house sound system to PC integration (is digital vs analog an option), and then the load to support that. Also, consider the number of incoming cameras video streams you have to decode. Adding cameras adds CPU load to process video stream
