Well, actually Catholicism did not come first. The Torah and the Law of Moses did. And we are told over and over in the Bible that what it teaches is "for all generations" and further that we are never to add to, or subtract from, it. We are also told "YHWH" aka God, "changes not."
Judaism, Protestantism and Catholicism are all full of traditions of men which are not in the Bible, and which often even flatly contradict it.
For example modern day Judaism says Rosh Hashanah, which just occurred last month, is the New year. However in Leviticus we see plainly that the first month of the year is in the spring.
Catholicism teaches things like "We offer up this Living Sacrifice" in masses, in reference to the host. However the Bible says that our Savior "died once for all." Also, it was His enemies, not His friends and followers, who offered Him up to the Cross.
Both Protestantism and Catholicism celebrate Christmas and Easter. The Bible never says our Messiah was born on December 25, or even in the winter, though that was the date of the birthday of sun gods and sometimes a time of child sacrifice. As for Easter, it is named after a pagan goddess whose symbols are the bunny and egg. Its date is set by the RCC and never, ever, falls on the true Resurrection date. For just one reason, the timing of the Resurrection is based on Passover and Passover follows a lunar cycle, not solar cycle, so it can't be on Sunday every year.
Judaism and Protestantism and Catholicism have certainly done some great things for the world. But again, they are filled with traditions of men and we don't need them. We need the Word and fellowship, yes, but not religion.