The Catholic Church bans use of condoms

If you sprinkle holy water inside a condom and contraception didn't work, does the child have God's blessing? Can you avoid contracting HIV if you sprinkle your penis with holy water and not use the condom? I don't understand why the Catholic Church bans the use of condoms yet spends a lot of money to pay for HIV treatments. How much more guilty can they feel inside their hearts....

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