I'm Catholic, but I have many non-Catholic Christian friends. They all admire the Church's position on life. Contraception is evil. What part of "Be fruitful and multiply" don't they understand
Gods first words to humanity "Be fertile and multiply" Gen 2:28
Gods first words to Noah after the flood "Be fertile, then, and multiply" Gen 9:7
Our God is a God of life. Satan is of death.
That is the basic.
Catholicism is completely compatible with natural law.
For further knowledge on this see Humanae Vitae