Just because you have a personal relationship with Mr. Skydaddy does not dictate the outcome for "We the People". Making a personal decision to be ruled by an invisible man doesn't equate to a legal responsibility for him to rule the rest of the country, believers and non-believers. Stop interjecting religious law into secular law!
And also, please stop being misguided to thinking this is a Christian Nation... it is NOT! Do just a little bit of research (this is just a small start to get you in the right direction), and you will find our forefathers were indeed interested in keeping church and state separated. We are a secular nation because the historical dudes realized true freedom comes from allowing all to express their beliefs in this country, but legislating it would give religion opportunities to make decisions in a process where faith and beliefs just don't belong.
Our country has a long history of religion trying to creep back into having a strong-hold.
Don't let it!