Doe salvation depend upon repentance? Is that performance? Can one be saved and never repent of their sins? What about believing? Is that performance? Why not?
Considering Jesus preached, 'repent the kingdom of God is at hand', I'm not likely to answer this rhetorical question with a no. In answer to the rest of the questions I can offer a definition for the term:
Repent (G3340 μετανοέω metanoeō) - To change one's mind, i. e. to repent (to feel sorry that one has done this or that, Jonah 3:9), of having offended someone, Luke 17:3f; with ἐπί τίνι added (the dative of the wrong, Hebrew עַל, Amos 7:3; Joel 2:13; Jonah 3:10; Jonah 4:2), of (on account of) something, 2 Corinthians 12:21; used especially of those who, conscious of their sins and with manifest tokens of sorrow, are intent; on obtaining God's pardon; to repent: μετανοῶ ἐν σάκκῳ καί σποδῷ, clothed in sackcloth and besprinkled with ashes, Matthew 11:21 (Abbreviated from Thayer's Lexicon)
Repent - lit., "to perceive afterwards" (meta, "after," implying "change," noeo, "to perceive;" nous, "the mind, the seat of moral reflection"), in contrast to pronoeo, "to perceive beforehand," hence signifies "to change one's mind or purpose," always, in the NT, involving a change for the better, an amendment, and always, except in Luk 17:3, 4, of "repentance" from sin… (Vine’s Dictionary)
The emphasis in the expression is on the thoughts and inclinations of the heart, aka 'the seat of moral reflection'. This like all aspects of salvation is a gift of God, unattainable by human effort apart from the grace of God and God's sovereign choice in election. Repentance is not simple required for salvation, it is an integral part of the gift of salvation. The way it works is your sin is 'imputed' to Christ on the cross, here translated 'numbered':
He was numbered G3049 with the transgressors. (Mark 5:28; Luke 2:7)
Then the righteousness of God is imputed to the believer by grace through faith, Abraham being the prime example:
And therefore it was imputed G3049 to him (Abraham) for righteousness. (Romans 4:22; Gen. 15:6)
My problem with your questions, as well as your insistence on salvation being performance based, is an absence of the gospel in your argument.
The problem with your position is the focus is solely on going to Heaven. Your position sees only having salvation. Loving God or man is not a part of the equation. They are not necessary in your theology it seems. So you ask questions that focus on losing that as though that’s all there is.
You need no presume to know my theology, if you look at the description below my avatar you will see I'm a Calvinist. The love of God is the precondition of salvation and the fruit of salvation, i.e. the fruit of salvation are the gifts and callings of God that are without repentance (Rom. 11:29). So far in your argument there isn't even a passing remark with regards to the gospel, the righteousness that is by faith or the manifestation of the Holy Spirit resulting in works of righteousness to the glory of God.
You at least had the presence of mind to call for a definition, I will wait to see if you accept it. Then we can talk some more.
Grace and peace,
Mark