So, if that's the mentality you take on being a Christian, you're going to your hell, anyway. That's not called believing, it's called rationalizing.
So, why are you lying to your god? Why should I?
You know, if god truly does exist, he'd have to be a complete ******* and have human traits in order for him to turn away someone who has lived their life very positively and without sin/****ing up hard/breaking laws/whatever you'd like to call it. So, if your god is like that and refuses to let a good soul into heaven just because he/she didn't believe in whatever religion worshiped him, assuming all of what you say exists, then he can go to hell :3
Edit: Just a quick edit, this isn't to say that religion is bad for you... some people need and love religion, and it does, generally, provide some very solid morals that everyone could use. Some people don't need religion and it works out neatly the same, they just get their morals from their culture, and most cultures have a heavy influence from religion. *shrug* The morals that most religions follow have been around since humans started telling stories, dating back through pretty much every civilization that had language or culture that the world has seen.