I've had an episode of mortal sin this morning! Please pray that I make it to confession tomorrow, and confess my sins well with compunction and perfect contrition for them. Needless to say, I don't want to be in a state of mortal sin while flying, and considering where I'm flying to, well, that would be a very embarrassing way to go to hell!
You look like not saved person to me , thing like mortal sin does not exist , by saying that you are saying that there is sin that God himself can't make you free of thus you say God is not perfect and blasphemy him.
Jesus took away our sins at cross , all sins forever , he took away your sins before you even were born by his Blood , he was the Lamb of God once for all. Look what Jesus said himself before he died on cross - John 19:30 .
It is finished , death has been defeated by Jesus , don't add anything to this because it's finished once for all . I will illustrate it for you below .
Imagine pizza , i love pizza , Jesus is like perfect pizza , it's full circle , you can't add anything to it , if you would be able to add anything to it maybe a triangle from other pizza then Jesus pizza would need to be not completed , then this would mean that he was not God , because God must be perfect.
Let Jesus be full pizza for you and just take him as he is , perfect .
Next example is Ethernal life , you can't lose it .
1 John 5:13
When you believe , you have ethernal life , if you could lose it first it would not be ethernal , second it would make God a liar because he promised you ethernal life , God can't lie thus when you get ethernal life , you get it forever

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Did prodigal son blow away all his inheritance (father's money) ? Yes he did blow it and screw him for this , but he could not just stop being child of his father because he blow away his money . When you are born again , you are Child of God , that does not mean when you drink beer you suddenly stop being Child of God , you cannot be unborn .
There is verse that literally kills any dubt .
2 Samuel 7:14-16
I will be his father, and he shall be my son. If he commit iniquity, I will chasten him with the rod of men, and with the stripes of the children of men:
But my mercy shall not depart away from him, as I took it from Saul, whom I put away before thee.
And thine house and thy kingdom shall be established for ever before thee: thy throne shall be established for ever.
Please consider being born again , read 1 Cor 15:1-4 , trust Jesus that he was enought love you
