What's the point in a credit card/buying house.?

People keep telling me i need a credit card to buy a house. I also get told if i don't regularly buy things with a credit card my credit score goes down. If i miss a payment with credit card, credit score goes down. It's all based off debt so corporations can make a profit. What's the point in having a credit card. I have a debit. Also why would you want to buy a house? You're trapped there with that money tied up in the house if something bad happens to it, not to mention if you purchase it on a loan it's going to chew up a bunch of income that didn't need to chewed up. Why not just rent? Is everyone brainwashed?