Can we still say we are gambling if the event is something we are at least 90% sure that we are going to win?
First of all, there is no event you can ever be guaranteed to win from.
Second, You are gambling no matter how small the chance of losing. Because of that possibility of losing, it’s still a risk and you are gambling to avoid that risk but it still exists. Honestly even if all signs point towards a specific event happening, it might still not happen.