Hmmmmmm ... Don't know.
Life is a tricky word, as is universe. Are we including God, if s/he exists? Or angels, spirits, ghosts etc. And by universe, are we thinking observable universe or a potential multiverse etc.
If we are including everything, then since I believe in God I'm going to say that life isn't restricted to earth. If we allow inclusion of a multiverse, then again since I think such is likely to be the case, it's inconceivable in a multiverse that life is restricted to earth.
However, if we limit ourselves to just our observable universe then it becomes much less clear. I've read books by Simon Conway-Morris and Paul Davies who argue that the goldilocks conditions required for life, and most especially human-like intelligent life, to originate and evolve are so astronomically rare that even the universe's vast size is no guarantee that there's any other life out there. Indeed, to both it seemed like we are probably the only intelligent life in the universe.
The Fermi paradox might also give one pause (or it does me!).
So, if we mean any kind of life anywhere in a multiverse - I think lots and lots and lots of life. If we mean intelligent life in our observable universe, I'm agnostic and don't know.