That is what the founders were trying to prevent, however. Many people were here in America because of having other people's religions shoved down their throats.
The free exercise of religion: YES! On public buildings that I helped pay for, etc.: NO.
The founders did not want a national religion. End of that story. They endorsed government being involved in religion in all manners of ways. From hiring clergy to preach to the native tribes, to holding full church services in the House of Representatives, to giving land to missionaries.
Ever read the constitutions of the various states? Many of the men who ratified the first amendment lived in states which had tax supported religions.