Difference between contraception and abortion?

Contraception is means of preventing pregnancy (like birth control), whereas abortion is killing the fetus while it is within the mother - which by all means would be murder, since the child is living and has a soul.

Again, reiterated, you cannot contracept a child, since contraception is the prevention. Abortion is killing the child within the mother.

It's important to remember that, if God plans something to be, it will be. His will cannot be prevented. You cannot go against God's will. If God wants you to have a child, then no form of prevention could cause otherwise - remember that Mary was a virgin and begot Jesus, and Abraham's wife Sarah was barren and begot Isaac.

Long story short - if the Lord wills it to be, it shall be.

If you commit suicide for the pure reason of preventing offspring, I believe you would answer for both your murder and the preventative murder of your offspring, since that intent would be in your heart.

With these kinds of questions (why is this OK and this not?) the question is really a matter of the heart. Why are you using contraception or why are you "using" abortion? God judges our hearts.

1 Samuel 16:17b ESV ...For the Lord sees not as man sees: man looks on the outward appearance, but the Lord looks on the heart.”

One can come up with several non-sinful reasons to use contraception. Perhaps a married couple wants to have sex but they don't want a baby because bring a baby to full term could kill the mother, or they can't afford a baby. The intent of the people there is a wise one, and that's just one example.

Try doing the same thing with abortion. Can you come up with a scenario where one can kill the unborn baby with holy intent? I don't think it exists, and I think that is the answer to your question. One's intent with contraception can be good or bad, but one's intent with abortion is certainly always bad.

You seem to be laboring with a misconception. contraception and abortion are not the same thing;

Contraception loosely defined is the prevention of a pregnancy, while Abortion is the termination of a pregnancy. And while there is some merit to your saying that they both thwart God's plans, you must balance that with the fact that an omniscient God knew that those choices would be made before he created the heavens and the Earth, and also it must be balanced with God not interfering with man's free will.

As far as to the prevention of life, yes it not only prevents one life, but also the lives of their posterity, which is a direct disobedience of God's command in:

Genesis 1:28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth.

From this we see that God had a secondary purpose in creating man which was to have him care for the rest of God' creation, and by putting man into the Garden of Eden;

Genesis 2:15 And the LORD God took the man, and put him into the garden of Eden to dress it and to keep it.

And even though man seems to be in opposition to God's will at almost every turn the truth is that:

God is all about forgiveness!

Psalm 103:10 through 12 He hath not dealt with us after our sins; nor rewarded us according to our iniquities. For as the heaven is high above the earth, so great is his mercy toward them that fear him. As far as the east is from the west, so far hath he removed our transgressions from us.

God is never so far away that he cannot hear our prayers of contrition.