Not commenting on tbombz specifically but many Christians somehow find a way of continuing to live "sinfully," because "everyone sins anyway" while still being Christian and preaching it. And then there are arguments whether homosexuality is a sin for Christians (I'm not a Christian so I'm not arguing either way, though I have certain opinions on what scripture says after reading it some in a past life).
People justify what they want, it has little to with Christianity. The issue is the people who find Jesus are often broken, lost, confused, corrupt, etc…. And they find a hope and purpose in their new life as children of God. But they don’t abandon all of their old ways, they are always a work in progress. Jesus is the standard that everyone knows but how many will live to that? The cop out is God forgives me, and He does, but that doesn’t mean everything is good (or forgotten by people).
The Bible is pretty clear about homosexuality. It is clear about sexual relationships outside of marriage, or lust. People struggle with whatever their issues are until they don’t. It doesn’t change the standards.