Because any church is a scam built to extract wealth and exercise control using overt and implicit threats and social pressure (and, once the religion is big enough, martial pressure).

Even the bible cautions against those who preach and proselytize on street corners and in churches and synagogues, and insists that a man's true relationship with and faith in god is done in private (though it also, in other parts, commands you to vigorously spread the word and influence of god, sometimes at swordpoint, so take it for what it is: a collection of human experiences and lessons written by different people at different times dressed up in religious magic trappings for the implied legitimacy).

The christian/catholic god wants your subservience and submission, and when you die, he wants your soul scrubbed clean and added to the eternal chorus to sing his praises. He certainly doesn't want your money - that's just the church.