Please read Is Faith a Form of Work? by Jack Kelley, at Grace thru Faith.
"I have a question about faith versus works. I am very much a “by faith alone, in Christ alone” believer (who also believes in OSAS). But, to be perfectly honest, I find myself wondering if faith itself isn’t a form of works. Believing is something you have to do to be saved. In other words, if you don’t “work” it by believing and receiving you won’t be saved. Isn’t that works?
Therefore they said to Him, "What shall we do, so that we may work the works of God?" Jesus answered and said to them, "This is the work of God, that you believe in Him whom He has sent."
But to the one who does not work, but believes in Him who justifies the ungodly, his faith is credited as righteousness...
For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; not as a result of works, so that no one may boast.