You do not need the doctrine of predestination to be secure in your salvation...
All those the Father draws to completion He then gives to the Son....
And, its the Fathers will that none he gives will become lost!
John 6:37-39
All those the Father gives me will come to me, and whoever comes to me I will never drive away.
For I have come down from heaven not to do my will but to do the will of him who sent me. And
this is the will of him who sent me, that I shall lose none of all those he has given me, but raise
them up at the last day.
He will lose none that come to Him!