No Christian does that anymore, its a symbol. And in Germany its not allowed anymore to shafts lambs
Practically they don't do it but the theme of sacrifice is the essence of the Christian faith. It is far beyond than just a symbolism. One can frequently read these lines in New Testament: “ransom in his blood,” “by his blood,” “the blood of his cross,” “my blood of the covenant which is poured out for many for the forgiveness of sins,” “reconciled by his blood,” “justified by his blood,” “propitiation by his blood,” “through the death of his cross,” “made peace through the blood of his cross,” “Christ our Passover has been sacrificed,” “Christ loved us and gave himself up for us, a fragrant offering and sacrifice to God,” “him who loves us and has freed us from our sins by his blood,” “the lamb which takes away sin,” “he bore our sin,” “was made sin for us,” “Christ redeemed us from the curse of the law having been made a curse for us,” and so on. Christ’s sacrifice was offered only once. It was accomplished “once for all.” Sacrificial lamb offering redemption and atonement for humanity's sins.
In Genesis 22 God commanded Abraham to offer his son Isaac in sacrifice. Before the sacrifice was actually carried out, however, God provided a ram to die in Isaac’s place. In Quran, As-Saffat, similar story has been told with a slight difference: Isaac becomes Ishmael. Contrary to the Christian faith, in Islamic faith, sin is an individual concept. Every one is responsible for own sins and salvation. Thus there can't be an "once for all" offering and salvation. No one can bear humanity's sins. The offeror comes with a consciousness of sin seeking restoration to God’s favor by means of the acceptable sacrifice.
Two different perceptions from the same source. One doesn't make the other either wrong, correct or arguable. Sacrificing an animal or sacrificing the Christ once, makes no difference. If you believe in one, then you have no right to judge on the other. If you believe in none, then you already know that none to judge. Faith is the faith.