Gratitude toward other people is one good thing, but gratitude toward our Almighty God is another. I've noticed that some people get defensive, saying something like, "But gratitude toward other people IS gratitude to God."
My response to them is, "Yes and No."
Expressing gratitude to God as written in traditional Jewish prayers, and expressing gratitude directly to God in our Jewish personal prayers is how we develop a relationship with our Creator.
Expressing gratitude to another person is one way we develop or strengthen our relationship with that person whose eternal soul is connected to God. But it's not the same as our relationship WITH God.
An attitude of gratitude toward other people and situations in our lives is certainly part of our relationship with God. It's how we live what we learn in Torah and from just being alive. Most of us live and learn to be grateful and to express our gratitude eventually.