Isn't there a law that says one has to believe in Jesus? Since one 'cannot keep the Law', doesn't that lead to the conclusion that anyone saved is predestined to be so?
And the same logic would follow that that would make belief a work.
Fortunately Scripture teaches us how this all works!
Ephesians 2:8 For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— 9 not by works, so that no one can boast.
You can do that. If not, ask Him to help you. He will. There's nothing legalistic about that.