Catholics believe that everyone is born with the stain of original sin. They also claim that all life is a gift from god. Hence, life is like a fruit basket from god, but with a rotten apple at the bottom of the basket. And the only way to make sure that rotten apple won’t spoil the rest of the fruit is to water board the entire basket.
This water boarding comes in the form of baptism. Baptism is a “sacrament” that Christians believe washes away the stain of original sin, which is said to afflict every human soul since Adam & Eve allowed their curiosity to kill not just the cat, but humanity overall.
Catholics use the water boarding of baptism on infants to wash away that pesky stain, while other Christian denominations require that a person make a conscious choice to be baptized first (however uninformed or misinformed about the religion they are being baptized into they may be). The reason Catholics do this is because, since the child knows nothing of the sin that God allowed that child to be born with - which can only mean that God necessarily wanted that child to be born that way - nor does it need to know that it is being forgiven for that sin (or even very much about the religion they are being baptized into).
Simply put, baptism is performed to return the child to as near a level of innocence as God will permit, which is great if the world was like the Garden of Eden, it's a jungle out there!
So aside from the fact that baptism is a "sacrament" that simply fails to deliver on its promise to make everyone as innocent as Adam & Eve (before their curiosity got the better of them, that is) - and is "intelligently designed" by God to fail to do so in order to foster a lifelong spiritual dependency upon one religion or another - it is also performed on infants without giving those children the right to decide for themselves if they really want that "stain" removed in the first place.
In a world run by greed and "survival of the fittest," in other words, baptism may only end up removing from us the sole asset - our "killer" instinct - most needed to survive. It's like being declawed and defanged before being released into the wild, with the purpose of hoping to make everyone more peaceful. In fact, it's exactly like gun owners arguing vehemently that "big government" (i.e. God) should confiscate all of their guns!
Baptism, in this sense, is like a form of spiritual castration, and may only end up turning the "king of the jungle" into a house cat.