You can't live stream to both at the same time directly through Zoom (it's one or the other); however, there are plenty of 3rd party tools that will allow you to do multiple streams (Restream.io and StreamYard are popular tools for regular streaming; Subsplash and other platforms allow multi-platform streaming for religious services).
Unfortunately, this is not currently possible with Zoom, as we can only support 1 live stream at a time. I know there is something being worked on that will expand this capability, but I don't yet have a firm ETA for when this will be available. I will respond back here when I have more info.
The Zoom App Marketplace has a solution that allows the host to stream to up to 3 different live streaming services! This app is built by Zoom and free to use: Zoom Live Streaming app
You can use multi streaming platforms like Restream, StreamYard, or OneStream Live. they let you broadcast to multiple destinations simultaneously without needing to set up anything too technical. Just connect your Facebook and YouTube accounts, and you’re good to go. It is Good to know, Zoom Also support this.
If you’re working with a brand also planning something more long term, you can explore platforms like VPlayed, Dacast . they support multi streaming and give more control over branding, monetization, and even audience targeting.