I do but terming it as OSAS I think is not helpful as it suggests that you can continue in sin. I think Perseverance of the Saints is a more accurate title. A quick summary of why I believe this is; the wk of Christ on the cross atoned for ALL my sins including the one I am yet to commit. The payment has been made by agents outside of us - our rejection of the payment has no bearing of what it has paid for.
John 6 talks about those given to the Son by the Father will never be lost.