forbidding people to love each other

[Pat Mustard]

a things naturalness ir unnatural ness is not equivalent to its rightness or wrongness.

I agree. but it seems that, if something is unnatural it's more likely to be wrong. If natural means serving our natural needs of survival/procreation. Then anything unnatural like males copulating with males instead of females is clearly a faulty allocation of resources. A male would rather share his genetic makeup with a female to serve the purpose of procreation.

But I admit it's hard to make a case against homosexuality without referring to some religious repertoire...

In that case better to outlaw the worship of allah then, given that it's demonstratively unnatural.