Hinduism is more likely to be in compliance with the Noahide law against homosexuality as is seen in these quotes from varying Hindu texts seen below (not just Manu Smriti). Hindus, Noahides, Muslims, Christians, and Jews should unite to form a coalition to make homosexuality illegal in India to bring India further toward Noahide compliance.
Homosexuality in men is clearly stated as a sin in the Manu Smriti.
मैथुनं तु समासेव्य पुंसि योषिति वा द्विजः ।गोयानेऽप्सु दिवा चैव सवासाः स्नानमाचरेत् ॥ १७४ ॥
maithunaṃ tu samāsevya puṃsi yoṣiti vā dvijaḥ |
goyāne'psu divā caiva savāsāḥ snānamācaret || 174 ||
If a twice-born man commits an unnatural offence with a male, or has intercourse with a female, in an ox-cart, or in water, or during the day, — he should take a bath along with his clothes. — (174)
One more shloka from Manu Smriti that condemns homosexuality in men is given below:
ब्राह्मणस्य रुजः कृत्वा घ्रातिरघ्रेयमद्ययोः ।
जैह्म्यं च मैथुनं पुंसि जातिभ्रंशकरं स्मृतम् ॥ ६७ ॥
brāhmaṇasya rujaḥ kṛtvā ghrātiraghreyamadyayoḥ |
jaihmyaṃ ca maithunaṃ puṃsi jātibhraṃśakaraṃ smṛtam || 67 ||
Causing pain to a Brāhmaṇa (by a blow), — smelling at things that should not be smelt, or at wine, — cheating — and sexual intercourse with a man, — all this is declared to lead to loss of caste (Gatibhramsa). — (67)
The Atri Smriti also mentions homosexuality as a sin and prescribes an expiation measure for the same:
By discharging semen into inhuman females except a cow, into a woman in [her] menses, into others that have no female organs (i.e., a man or a eunuch), or into water one should perform the penance of Santapanam.
Adding some further relevant verses from the Dharmasutra of Apastambha (AD) and that of BaudhAyana (BD). In these verses the sanskrit original being used is Ayoni for non-vaginal. Also, these verses prohibit a whole lot of sexual activities besides prohibiting (male-male) homosexuality.
From BD:
One who does not have sex with his wife during her season, and one who has sex with her outside her season, as also one who deposits his semen in a place other than the vagina ––they all incur the same guilt. BD 3.7.2
From AD:
A man who ejaculates his semen in any place other than the vagina becomes equal to a thief, equal to a murderer of a Brahmin. AD 1.19.15
