The controversial amendments to the marriage bill being debated in parliament are likely to be blocked by key MPs who refuse to support them.

Members backing the bill believe they have enough votes to form a majority to defeat any changes, according to The Sydney Morning Herald.

A range of proposed amendments were introduced to the House of Representatives on Monday, which would allow discrimination against same-sex couples by civil celebrants, businesses and charities.

MPs Michael Sukkar and Andrew Hastie, who introduced the amendments, claimed anti-discrimination laws were “significantly unbalanced” toward protecting LGBTI people, while offering “no protection at all” to those who would like to discriminate against them.

Sukkar and Hastie also want the Marriage Act to “separately recognise both man–woman marriage and two-person marriage”, which has been criticised as a problematic “separate but equal” approach to same-sex marriage.

The proposed amendments are largely the same as those rejected by the Senate last week.

Key crossbenchers and Liberal MPs have said they will not back the amendments.

Financial Services Minister Kelly O’Dwyer said she is unconvinced by the proposed amendments so far, and key crossbencher Cathy McGowan said “they would have to be good arguments” to earn her support.

The marriage equality bill is still expected to pass unchanged this week.

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