I actually differ on this because of one main reason: nowhere in the Bible is marrying a cousin condemned, forbidden by GOD. So because of that, anything about genetic defects is void and something of the world's opinion, in my opinion.

A child can be born with problems no matter who you marry. When you have GOD's grace on you in Jesus Christ, nothing else matters. Its faith in Him, following Him and walking with Him that matters.

My parents were cousins when they got married. So were my grandparents and even one of my aunts/uncles. Grandparents had 12 kids. My aunt and uncle had 4. My parents had 3. Everyone born is blessed abundantly. No one had any genetic problems whatsoever.

To each their own of course. We must always seek Him first and we can do so by reading His word and praying on every matter.