A non-practicing Catholic, I guess, is someone born into the Catholic faith who no longer adheres to any of it’s prescribed behaviours or rituals, and I would suppose some people don’t feel they need to practice it once they know how to do it. Practicing Catholicism must be for newbies.
But Baptists are a different beast all together. Technically, if you follow the letter of Baptist convention, no one is born into the Baptist faith. No one, no matter the circumstances of birth, can become a Baptist without actively choosing to do so, though the age of consent for such a choice is surprisingly low. This is why you see so many Baptist preachers dunking little kids in the water—it shows those children have chosen of their own free will to live their lives for Jesus. And if you check the news of late, you’ll find some preachers seem a little confused about what other things children are or are not able to consent to, under the laws constructed by good old human beings.
Once your accepted in the fold, you are saved, and there’s not much you can do to get kicked out, and you don’t have to practice, either. If you don’t keep up your Godly work by staying clean and pure and avoiding all the temptations the earth has to offer, you’re only human and no one should throw stones at you (according to New Testament law).
If you’ve slipped a little, you’re officially a backslider. Baptists believe that a truly saved person can’t genuinely fall out of favor with God. If you actively reject God and all God’s work, you are not a backslider but a reprobate, and God will surely turn against you, because when you said you wanted to devote your life to Jesus when you were six, you must have been a lying little demon.