Why is contraception a deadly sin?

We are created in God’s divine image (Gen. 1:27) and our bodies are temples of the Holy Spirit (1Cor.6:19-20). Therefore, all actions of our bodies must conform to God’s design. God’s design for us is to use our bodies according to what they are created for. In other words, use each organ for what it is created for. Therefore, if our bodies do what is unnatural it goes against God’s design. We have many physiological functions; such as: respiratory, cardiovascular, and nutritive. However, there is only one function in which two human beings of opposite sex are needed. This function is reproductive function. By nature therefore, this function can take place only between a man and woman. Any other way would be aberrant or a perversion. Similarly, to engage in this physiology, and eliminate the very purpose of the physiology by contraceptive methods would be aberrant or a perversion. It is like eating food only for fun, without wanting its nutritive benefits. The Roman did this by inserting devices in the back of their throats in order to stimulate vomiting mechanism. They would vomit the food and then continue eating.
When we go against the very physiological purpose, we are going against the creator of the physiology, which is God. In addition, contraceptive methods are directly against life and some of them kill embryos by preventing their implantation on the uterine wall. Contraception is therefore, anti-life and therefore against God. Furthermore, it makes conjugal union sterile or devoid of any life-giving element. It therefore, degrades conjugal union in marriage from a sacrificial and holy act, to an act of selfish desire; and makes the couple look at each other as objects of pleasure, rather than temples of the Holy Spirit. It is therefore, no surprise that in the scriptures a contraceptive act was considered deadly in the eyes of God (Gen.38:8-10).
From the very beginning God commanded us to be fruitful and multiply (Gen 1:28, 9:1, 7; 35:11). God exalts His people by blessing them with children (1 Chron. 25:5). Children, therefore, are God’s blessing (Psalm 127:3-5) and child bearing is a saving grace to women through which she may be saved (1 Tim. 2:15). In addition, Paul tells us that the love between a husband and wife must be similar to Christ’s love for His Church (Eph. 5:25), which is total, selfless and sacrificial. Married couples are therefore, called to give themselves completely to the other and be open to receiving children in a spirit of love, sacrifice and selflessness.