I enjoyed your video and have noted your position on the subject. The video is beautiful and well presented. The phrase, can salvation be lost, is a matter of semantics. Of course, it can be phrased differently, but what matters is that the reader understands the question.
Those who are uncomfortable with the reality that salvation is not a get-out-of-hell-free-card, argue that those who fail to endure to the end were never saved, to begin with. When pressed for scriptural support, they quote scriptures out of context. I will use only two passages to nail my case that salvation is not permanent and can be lost if we fail to endure to the end.
In the Olivet discourse, Jesus warned the disciples and by extension, believers throughout the church age that only those who endure unto the end shall be saved.
Matt 24:13 But he that shall endure unto the end, the same shall be saved.
To understand this text, first, we must recognise that Jesus was addressing saved believers. For an unbeliever cannot endure for a cause he does not believe in. Shall be "saved" here should not be mistaken as coming to faith, or being saved like one that has just accepted Christ or born-again. Such rendition is wrong because Jesus was referring to those who are already in Christ!
Also, the end in the text denotes the end of the believer's mortal life because according to Rom 6:7, we sin no more after death. IOW, our fate is sealed at death and our relationship with God at the point of death determines whether we resurrect unto life or condemnation (John 5:29).
Another example of note is Paul's famous argument concerning his people Israel in Rom 11. He started with a rhetoric question "Has God cast out his people?" And then went on to declare "God forbid" and stated that he, too, was an Israelite. At the end of the chapter, he expressed hope for Israel’s redemption – which I agree with. I don’t believe in the Replacement theology.
Every real Christian knows the narrative in this chapter, so I will cut to the chase. After acknowledging the sin of his people Israel as the reason they were broken off from the olive tree (Jesus Christ), he pointed out that Gentiles were subsequently grafted in by faith.
Rom 11:20 Well; because of unbelief they were broken off, and thou standest by faith. Be not high-minded but fear.
11:21 For if God spared not the natural branches, take heed lest he also spare not thee.
22 Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.
The Gentiles (everyone that is non-Jewish) grafted into the olive tree refer to those who are born-again and in Christ. An unbelieving Gentile cannot be grafted into Christ! Where other texts are ambiguous e.g. Heb 6:4-6, etc, on whether one can lose their salvation, Rom 11:21 dispels any doubt.
In conclusion, we see believers in Matt 24:13 and Rom 11:21 warned as clear as can be, that they MUST endure, abide or remain in Christ all through their mortal life in other to receive the fruit of salvation, ie immortality/eternal life. So, in the end, it comes down to the individual - whether they wish to believe the holy scriptures or twist it to validate their warped doctrine thereof. I hope this helps.