Please read this whole post before responding -- thanks.
My church seems to think it is, and is supporting political opposition to a voluntary euthanasia bill being discussed in my country. I don't see why euthanasia is necessarily sinful though.
I've heard it argued that it's murder. What makes it murder? Obviously not all killing is murder. To my mind, murder has to do with hate, as per Jesus' statement about hating your brother being equivalent to murder in your heart, it's an attitude. I really don't see how someone choosing to end their life because they're suffering with incurable cancer or whatever is in the same spirit as that. Even if suicide is arguably sinful for other reasons, such as hatred of self (and if you want to suggest that all desire to end one's own life is necessarily hatred of self, burden of proof for that position is on you), I can't see how that should result in blanket opposition to euthanasia.
Or someone else may argue that the timing of our death is to be left to the sovereignty of God. This doesn't make any sense, because nothing we do can interfere with that anyway. By the same logic, you may as well not wear a seatbelt when driving because to do so would be failure to trust the Lord and leave your safety to his care, as it's not your place to attempt to control your fate.
Besides this, when taking other teachings by St Paul about it not being our place to judge those outside the church, and his teachings about not letting your liberty be determined by someone else's conscience, I can't see a good reason for a Christian to politically oppose something like this. It seems to me there's more emotionalism than scriptural reasoning being employed to justify a stance against it.
First I would like to state that Christians should not have any part in politics. What is of the World is worldly and we are to be separate and spiritual. I am replying only to give scriptural backing against the Act of euthanizing humans, not any man made law for or against.
1. Killing any man for any reason is a sin.
Most Christians believe its okay to kill or harm others while protecting themselves, family, or country. Most so called pastors agree, but the word of God says contrary. Christ Yahshua says in
Matthew 5:7-9
7 Blessed are the merciful: for they shall obtain mercy.
8 Blessed are the pure in heart: for they shall see God.
9 Blessed are the peacemakers: for they shall be called the children of God.
Matthew 5:38-39
38 Ye have heard that it hath been said, An eye for an eye, and a tooth for a tooth:
39 But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Matthew 5:44
44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
John the Baptist told roman soldiers in,
Luke 3:14
14 And the soldiers likewise demanded of him, saying, And what shall we do? And he said unto them, Do violence to no man, neither accuse any falsely; and be content with your wages.
1 Peter 3:9 says,
9 Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.
Ephesians 6:15 says,
15 And your feet shod with the preparation of the gospel of peace;
When Paul was struck in the mouth he did not retaliate with violence,
Acts 23:2-3
2 And the high priest Ananias commanded them that stood by him to smite him on the mouth.
3 Then said Paul unto him, God shall smite thee, thou whited wall: for sittest thou to judge me after the law, and commandest me to be smitten contrary to the law?
Revelation 13:10 says,
10 He that leadeth into captivity shall go into captivity: he that killeth with the sword must be killed with the sword. Here is the patience and the faith of the saints.
Matthew 26:51-52
51 And, behold, one of them which were with Jesus stretched out his hand, and drew his sword, and struck a servant of the high priest's, and smote off his ear.
52 Then said Jesus unto him, Put up again thy sword into his place: for all they that take the sword shall perish with the sword.
Christ also says we are to be as wise as a serpepnt and as harmless as a dove,
Matt 10:16
16 Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves.
Of course this goes against human nature. But Christ followers are to be separate and different than worldly people. They are peaceful, loving, and kind. When a man kills another man he takes not only his life but also that mans chance to repent and be saved. For all who die in sin are damned. This is why Christians can not harm or kill anyone for any reason.
James 1:19-20
19 Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath:
20 For the wrath of man worketh not the righteousness of God.
Ephesian 4:26,31-32
26 Be ye angry, and sin not: let not the sun go down upon your wrath:
31 Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:
32 And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.
1 Peter 3:8-14
8 Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous
9 Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.
10 For he that will love life, and see good days, let him refrain his tongue from evil, and his lips that they speak no guile:
11 Let him eschew evil, and do good; let him seek peace, and ensue it.
12 For the eyes of the Lord are over the righteous, and his ears are open unto their prayers: but the face of the Lord is against them that do evil.
13 And who is he that will harm you, if ye be followers of that which is good?
14 But and if ye suffer for righteousness' sake, happy are ye: and be not afraid of their terror, neither be troubled;
Romans 8:36
36 As it is written, For thy sake we are killed all the day long; we are accounted as sheep for the slaughter.
Revelation 12:11
11 And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
So whoever helps you kill yourself is guilty of sin for killing you.
2. Killing yourself is a sin because you are destroying the temple of the Lord(Acts 7:47-50, Acts 17:23-25, 1 Cor 3:8-11, 16-17, 1 Cor 6:13,15, 17-20, 1 John 3:24, 1 John 4:14-15, 2 Cor 6:16). Our body's are to be presented as Holy and acceptable(living sacrifice, Romans 12:1) harming yourself and killing yourself desecrates the temple of the Lord which is a sin. Everything we do is supposed to be done to Glorify God(Colossians 3:17, 23-24, 1 Cor 14:26, 1 Cor 10:31-11:1) killing yourself does not glorify God, but instead it dishonors him.
3. Not wearing a seat belt would be breaking the Law of Man which would give the appearance of Evil which we are to abstain from(1 Thess 5:22) and would also be breaking the law of man which is only okay to break if it disagrees with the law of God(Daniel 6:8-16, Daniel 3:12-29, Acts 5:27-29).
4. We are to judge all things/people by the word of God( 1 Cor 2:15, 6:2-5, Matt 7:1-3) for in heaven we shall judge angels and to the saints the judgement of the world is committed. So taking Paul's writings in context with the rest of the Sword of God we see that we are to Judge everyone by the word of God alone. That does not mean we execute Judgment and force the truth and the righteous way of life onto anyone, it only means that we Judge everything/everyone we come into contact with by the word of God. Christ alone has power on earth to execute Judgement(John 5:22-23,27,30).
5. Lastly I would like to point out again that I am only giving scriptural support against the Act euthanizing someone or choosing to be euthanized yourself. Where politics are concerned we are not to play any part but we can still tell people the right way to live, it is up to them to choose it.