I have no faith and I don't understand how to get it.
I'm sad for you and will include you in my prayers. Faith
is a gift. But, God always honors and answers sincere and humble prayers in accordance with His will. God would NEVER say NO to someone who truly desired the gift of faith in Him through His Son Jesus Christ.
In fact, God goes out of His way to give people every chance to believe before he allows their hearts to become permanently hardened. It takes more energy to block out the presence of God than it does to allow Him in once He pursues a person, and pursue a person He will. (Read the non-fiction works of C.S. Lewis and how he came to
really know God, for example. Or, read
The Hound of Heaven, by Francis Thompson, a remarkable work of poetry, for further explanation).
Would you mind sharing more of your story as to what originally caused you to stop believing in God? Did you experience a severe tragedy in your life that caused you to lose your faith?
You list your faith as "Catholic" and you're participating on a Christian forum, which would lead me to believe you have some modicum of faith. Or, have you felt like you've always been merely mouthing the words of faith without having allowed the Spirit to truly enter you? I'm only guessing here, of course. I would sincerely like to help if I can and if you're interested.
Something I've noticed with a few atheists I've known personally tends to be a rather smug and disdainful attitude towards believers. I'm not saying you have that attitude but I've encountered those who feel more educated, more intelligent, more "scientific," etc., than those whom they misperceive as being less intelligent, i.e., the "typical believer," in their opinion. Which only shows their ignorance as some of the most intelligent, scientific, brilliant and highly educated minds in the history of the world became believers. Those things don't go hand-in-hand with belief, in fact, at times a high intelligence and level of education can be a stumbling block to faith. That's the meaning of Proverbs 3:5:
"Trust in the LORD with all your heart and lean not on your own understanding."
If you think you'll find God through your logic or your intelligence or your wit you won't. God honors a sincere and humble person who truly wants to receive His gift of salvation. It does take a sincere humbling of the heart and mind, it's true. Nobody can approach God with a sense of pride and think it will get them anywhere fast.