1) A saint is one who is forgiven through faith in Christ work on the cross.
2) Christ died for every single sin not just to some. And on account of that, all sins can be forgiven when they come to Christ.
3) All those who are truly saved will persevere to the end.
It will not perish for those who believed in Him.
31 Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed;
32 And ye shall know the truth, and the truth shall make you free. John 8:31-32.
Believing Christ is to continue in His word.
My next question:
Is there an instance in the bible or a verse that a Christian has been ex-communicated or not worthy of the eternal life?
Do you believed in OSAS(once saved always saved) my friend?
Because in this kind of belief we don't have to do good anymore because anyway we are saved and ensure of the eternal life because of the word "will not perish".
Because God want us to check ourselves every now and then about our faith and the salvation.
5 Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates? 2 Corinthians 13:5.
Peace!