The Catholic Church teaches that other religions can have degrees of truth and goodness in them and that we can embrace these aspects of those religions. For example, many religions teach that murdering human beings is immoral. That’s an element of truth. No religion is probably COMPLETELY false in the sense that they don’t teach anything true at all. So we don’t have to totally reject other religions.
You’re also not likely to win converts if you call their religions false. They’ll probably take it the wrong way and not listen to you further, even if you end up making good points. We need to approach things from their perspectives to seek common ground, promote mutual understanding, and lead them to the truth.
We do believe that our Faith is superior because it has the FULLNESS of truth, goodness, and salvation. Those religions that are most similar to ours are closest to the truth. For example, Islam is closer to us than Buddhism; Judaism is closer to us than Islam; Protestantism is closer to us than Judaism; Eastern Orthodoxy is closer to us than Protestantism, etc.