Atheists, tell me, a Roman Catholic: why should I become an atheist?

[Catholic_Lady]

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Then I'd say that sounds like a cultural thing more than any sort of official Church teaching. If you are saying Catholic theology teaches that women are objects, the burden is on you to show the Catechism verse that states such. 

Sorry, I'mnot a Catholic so I dont know what a 'Catechism verse' is. Does this count? It's from God's own mouth.

Deuteronomy 21:10-14 NAB)

"When you go out to war against your enemies and the LORD, your God, delivers them into your hand, so that you take captives, if you see a comely woman among the captives and become so enamored of her that you wish to have her as wife, you may take her home to your house. But before she may live there, she must shave her head and pare her nails and lay aside her captive's garb. After she has mourned her father and mother for a full month, you may have relations with her, and you shall be her husband and she shall be your wife. However, if later on you lose your liking for her, you shall give her her freedom, if she wishes it; but you shall not sell her or enslave her, since she was married to you under compulsion.

Sure it's in the old testament, the less regarded part of the bible, but Jesus said not a letter of OT law shall be overturned until the end of times (see my signature for reference).

No, it does not. 
When a Catholic wants to know what the catholic position is on something, we crack open the Catechism. Not the bible. And especially not the OT lol. Contrary to the protestant religions, in Catholicism, the authority of the Church comes first, before the words of the bible which are confusing and can be interpreted in many different ways. 
So yes, if you're claiming that Catholicism teaches that women are objects, you'd have to point to official Catholic doctrine that states such.