Yeah this feels like a trap or something

Not a trap or anything, just a calculated pivot. The doctrine within the church is the same, and gay couples still can’t be sealed. This bill is getting support because it carved out an exemption for religious institutions, so they won’t be able to lose tax-exempt status for not performing these marriages. That’s preferable to the church over a theoretical bill that did not have said carve out, which would cause major problems for the church.

That being said, it’s still good that they’ve gone from supporting legislation to ban gay marriage (prop 8 in California) to supporting legislations that protects it, so regardless of the church’s motivations, I still see it as a positive.