"If any of you wants to be my follower, you must turn from your selfish ways, take up your cross, and follow me." --Jesus
The verse you quoted in context:
Mark 8:33-35 (AMP)
33 But turning around [His back to Peter] and seeing His disciples, He rebuked Peter, saying, Get behind Me, Satan! For you do not have a mind intent on promoting what God wills, but what pleases men [you are not on God's side, but that of men].
34 And Jesus called [to Him] the throng with His disciples and said to them, If anyone intends to come after Me, let him deny himself [forget, ignore, disown, and lose sight of himself and his own interests] and take up his cross, and [joining Me as a disciple and siding with My party] follow with Me [continually, cleaving steadfastly to Me].
35 For whoever wants to save his [higher, spiritual, eternal] life, will lose it [the lower, natural, temporal life which is lived only on earth]; and whoever gives up his life [which is lived only on earth] for My sake and the Gospel's will save it [his higher, spiritual life in the eternal kingdom of God].
>>>>This revelation is profound if you will receive it. God has His plan for Salvation. Religion, in this case Peter under the inspiration of the god of this world, wanted to do it a different way. That is why there was such a strong rebuke of Peter.
God's Salvation plan is just too simple for the religious. Pride fuels the human desire to earn it instead of placing their faith in God's Love and His Grace. The enemy wants you in bondage, confused, doubting, under condemnation, and in unbelief, never knowing with certainty your standing or relationship with your Heavenly Father. Religion is the enemy's greatest tool.
So, with that in mind, what do you propose Believers could do on this side of the cross that would surpass what Jesus has already done for YOU? Is there anything you could suffer, endure, or do, that would prove to God that you are worthy of His favor?
Ephesians 2:1-10 (AMP)
1 AND YOU [He made alive], when you were dead (slain) by [your] trespasses and sins
2 In which at one time you walked [habitually]. You were following the course and fashion of this world [were under the sway of the tendency of this present age], following the prince of the power of the air. [You were obedient to and under the control of] the [demon] spirit that still constantly works in the sons of disobedience [the careless, the rebellious, and the unbelieving, who go against the purposes of God].
3 Among these we as well as you once lived and conducted ourselves in the passions of our flesh [our behavior governed by our corrupt and sensual nature], obeying the impulses of the flesh and the thoughts of the mind [our cravings dictated by our senses and our dark imaginings]. We were then by nature children of [God's] wrath and heirs of [His] indignation, like the rest of mankind.
4 But God—so rich is He in His mercy! Because of and in order to satisfy the great and wonderful and intense love with which He loved us,
5 Even when we were dead (slain) by [our own] shortcomings and trespasses, He made us alive together in fellowship and in union with Christ; [He gave us the very life of Christ Himself, the same new life with which He quickened Him, for] it is by grace (His favor and mercy which you did not deserve) that you are saved (delivered from judgment and made partakers of Christ's salvation).
6 And He raised us up together with Him and made us sit down together [giving us joint seating with Him] in the heavenly sphere [by virtue of our being] in Christ Jesus (the Messiah, the Anointed One).
7 He did this that He might clearly demonstrate through the ages to come the immeasurable (limitless, surpassing) riches of His free grace (His unmerited favor) in [His] kindness and goodness of heart toward us in Christ Jesus.
8 For it is by free grace (God's unmerited favor) that you are saved (delivered from judgment and made partakers of Christ's salvation) through [your] faith. And this [salvation] is not of yourselves [of your own doing, it came not through your own striving], but it is the gift of God;
9 Not because of works [not the fulfillment of the Law's demands], lest any man should boast. [It is not the result of what anyone can possibly do, so no one can pride himself in it or take glory to himself.]
10 For we are God's [own] handiwork (His workmanship), recreated in Christ Jesus, [born anew] that we may do those good works which God predestined (planned beforehand) for us [taking paths which He prepared ahead of time], that we should walk in them [living the good life which He prearranged and made ready for us to live].
Oh, if only people would actually read the Pauline Epistles. This is God's revelation to the Body of Christ, and it will end most religious ignorance if received.