Greetings. I am a computer programmer, so I have an analogy to present my argument that resides from my background. It's not too hard to understand if you do not know programming. The principles can be applied to almost any area of life.
When you write a program to do something specific, there are certain guidlines and boundries that are defined by the language in which the program is written. For instance, Visual Basic uses a function call "MsgBox", which basically displays a pop up box with some sort of message. You could not, however, use the word "PopupBox" and have the same results. This is called syntax. If you do not follow the syntax of a language, you do not have a valid program. Each language has different syntax, which is the standard for that language, so you could use any programming language and apply the following principle: In order to have a valid program, you must follow the standards of that language. Anything other than the standards is simply, wrong.
Likewise, God has a standard for us. We cannot change what God says, we cannot put words in His mouth, nor take them away. God made rules for us to follow. If we do not follow God's standards, then we do not have a valid program, per se. However, the consequences for not following God's standards are far more severe than not following the standards of Visual Basic.
I'm not here to tell you what I believe God's standards are, He's done just fine by speaking through the prophets, appostles, and of course, Jesus. What I am here to say, is that there is only 1 right way to get to heaven. There is only 1 standard to follow. If you are not following those standards, then I challenge you to look deep in your heart and decide if it is time to follow God's word.
Thanks for your time,