Is freedom of religion important only for those who belong to any religious group, and not those who don't?

It is important to everyone.  The government shouldn't tell anyone how, when, where or even if to worship.

Freedom of religion was processed more as a Freedom from Religion. The Forefathers wrote this in to keep government from establishing a "National Religion". In short, it guarantees that  no citizen would be told what religion they HAD to HAVE like many countries in Europe did at the time.

So while many echo "It also means you have the freedom to have no religion", this is offered incorrectly as a SIDE NOTE. Really, the main concept is a freedom to have no religion and you also have the freedom to have ANY religion as long as it doesn't interfere with another citizen's liberty.

Many Christians have declared that our Nation was founded as a Christian nation and not a secular one. They misinterpret the constitution in much the same way they misinterpret the Bible . . To fit their worldview. Now, as more people move away from religion, Christians are digging in their heels to hold unto what never was theirs from the beginning.

I think freedom of religion includes the option for people to choose no religion at all, so, yes, it is important to religious and non-religious people alike.

Religion has earned such a bad name for itself because leaving the instructions that are creator gave us. Our creator has promised to correct the problem when his purpose of having the earth inhabited by those that will accept his loving guidance and protection. The bible says at Rev 21:3,4 "Look! The tent of God is with mankind, and he will reside with them, and they will be his people. And God himself will be with them. And he will wipe out every tear from their eyes, and death will be no more, neither will mourning nor outcry nor pain be anymore. The former things have passed away.