Anyways, they never say (mortal sin) in the Bible! It doesn’t matter what the Catholic Church says, you can receive communion, Upgrade. Don’t abstain!"
So their thought process is it has to say the exact words “mortal sin”? If we are allowed to use that thought process then I can have the Bible say what ever I want it to say.
The Bible most definetly speaks of deadly sin which is what mortal sin is.
I John 5:16-18:
If anyone sees his brother committing a sin that is not a deadly sin, he will ask, and God will give him life for those whose sin is not deadly.
There is sin which is deadly; I do not say one is to pray for that. All wrongdoing is sin, but there is sin which is not deadly. We know that anyone born of God does not sin, but He who is born of God keeps him, and the evil one does not touch him.
These verses cannot be any plainer that there is such a thing as “deadly sin” and “sin which is not deadly.” That is precisely what the Church means by mortal (sin unto death) and venial (sin not unto death) sin.
Revelation 21:8
8 But as for the cowardly, the faithless, the polluted, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot shall be in the lake that burns with fire and brimstone, which is the second death.”
Revelation 22:15
15 Outside are the dogs and sorcerers and fornicators and murderers and idolaters, and every one who loves and practices falsehood.
Ephesians 5:5
5 Be sure of this, that no immoral or impure man, or one who is covetous (that is, an idolater), has any inheritance in the kingdom of Christ and of God.
Colossians 3:5-6
5 Put to death therefore what is earthly in you: immorality, impurity, passion, evil desire, and covetousness, which is idolatry. 6 On account of these the wrath of God is coming.
For more info on where I got this on mortal sin follow this link or have them take a look.
catholic.com/blog/tim-staples/mortal-and-venial-sin