In the context of 2 Tim 3:16,17 "perfect" means complete. It does not mean absolute perfection. We are absolutely perfect (righteous) because God imputes His own righteousness to us through Christ. So when Christ says we are to be as perfect as our Heavenly Father, it means that He will make us perfect by His grace. That is definitely not a license to sin, but an incentive to be holy.If all Scripture is profitable for me to be PERFECT unto EVERY good work, then what do I need of these outside sacraments or church traditions for?
That also answers both your questions: (1) you do not need sacraments and church traditions to ADD to Christ's perfection and (2) you cannot lose your salvation because imputed righteousness is a GIFT from God, and sinning saints will be dealt with in a number of ways according to Scripture, without losing their salvation.
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