The Multiverse “is a direct consequence of our best current theories, if they’re correct.” The Multiverse “makes no predictions for any observable phenomena that we can access from within our own pocket of existence”.
In other words, it is a matter of faith taken on faith in our equations for our observable universe — forever untestable and unprovable beyond the bounds of our observable universe.
That’s perfectly fine. Each of us is free to make our own choice of which articles of faith regarding how and why we and the universe are here appeal to us. But let’s not deceive ourselves that believing in the unknowable and unprovable is anything other than a matter of faith.