The core theme of Quran is Jesus Christ did not die on the cross, Once Apostle Peter brought this idea to Jesus Christ - From that time Jesus began to show his disciples that he must go to Jerusalem and suffer many things from the elders and chief priests and scribes, and be killed, and on the third day be raised. And Peter took him aside and began to rebuke him, saying, Far be it from you, Lord! This shall never happen to you - Matthew 16:21-22

Christ response confirms how dangerous the theme of Quran is - But he turned and said to Peter, Get behind me, Satan! You are a hindrance to me. For you are not setting your mind on the things of God, but on the things of man - Matthew 16:23

Denying Christ's death is basically denying God's love towards us - but God shows his love for us in that while we were still sinners, Christ died for us - Romans 5:8