Its more than they all believe in God. All religions believe in some god concept. These three religions all believe in the same exact God; Yahweh, the God of Abraham. So who knows which set of windows Yahweh likes best, but it isn't the religion that gets to determine who gets to heaven. If Yahweh really exists, he will decide, right? And if love and belief play a part in the decision, then all three religions can check that box. You are interjecting your own beliefs here. To the Christian, they believe that you must believe in Jesus to get to heaven (i.e. religion matters)
Now why half the world decided to worship a minor Canaanite god out of all the thousands of gods that one might choose from is a mystery to me, but thats the reality. So if worshiping Yahweh is important to the real god, then half the planet is in good shape. Of course if the other thousands of god options are also real, that might be a problem for all but the skeptic. A good case could be made that the non-believer is really playing the Pascal's wager game best.