Birth control is not necessarily wrong. Condoms and intrauterine devices do separate sex from conceiving children. Married couples could use these devices to help plan when and if they have children.
Sex is a human activity.
But it deserves context.
Biblical standards mandates that sex be done in a marital relationship. “Let marriage be held in honor among all, and let the marriage bed be undefiled, for God will judge the sexually immoral and adulterous.” (Hebrews 13:4)
All humans are made in the image of God. Since sex is part of our humanity, God has the right to decree how we exercise our sexuality.
Therefore having sex outside of marriage would be considered rebellion against God because it goes against the design He has for our sexuality and such an offense would rightly be punished by Him. Sexual sinners have two choices: repent and believe in the good news of Jesus who was crucified and risen on their behalf or face Jesus for their sins at their deaths or Judgment Day.
Ideally, humans should find someone of the opposite sex that they love and take the time and effort to commit to that person in spite of the inevitable flaws and mistakes that they see in one another.
However, God shows common grace to all. If people reject the authority and rule of Yahweh, it would not be expected that they would obey His moral teachings regarding human sexuality. That being said, sexual sinners could still use birth control to help mitigate the consequences of their actions like sexually transmitted diseases.
There is also the issue about using tax money to subsidize birth control for women.
I generally believe that women should pay for their own birth control, just as anyone else would pay for their own physician visit. People should not have to pay for the costs of other people’s decisions. Sex is voluntary: it takes both the man and the woman to agree to sexual relations. If it does not involve consent, then it would no longer be sex, but devolving into coercion and rape.
Ultimately, sex is a blessing when it is done in the marriage covenant, a grace for unrepentant sinners and redeemed saints. Birth control helps married couples plan if and when they have children. It also protects those engaged in premarital sex from sexually transmitted diseases even as we hope and pray that the Spirit might regenerate their hearts to solve the deeper issue of their rebellion against God.