how would marriage equality destroy america?
It destroyed every other society that normalized the practice. It's toxic. It is an acceptance that depravity is normal. When started, the trend never stops until the society is fully decayed and corrupt.
you have documentation proving this? or is just an opinion?
The historical record is pretty clear. The mainstreaming of homosexuality became an accepted practice of many civiilizations, Egypt, Rome, Greece. That value was never passed along as beneficial to any succeeding civilization. If it had been, same sex marriage would have been an accepted practice for thousands of years and we wouldn't be talking about it now.