What is your second favorite religion?
There is no answer for this question. It's like asking what my second favorite grass color is. No other color but green is acceptable, so there cannot be a second favorite color. (Keep in mind that no analogy is perfect. If you were to follow this to completion, I bet it would fall apart as well. This is as close as I could get to how it is in reality.) In the same way, I have seen that there is no other way to heaven than through Jesus' grace which He freely gives.