“Is there anything in the Bible that might allow for same-sex marriage?”—Mark
The Bible is unabashedly straightforward: the ideal for marriage is heterosexual. There are admittedly various forms of marriage in the Bible that may not meet the definition of what is often called the “traditional family” (e.g., multiple wives, concubinage, close degrees of marriage between half-siblings, cousins, et al).
Furthermore, wedding “ceremonies,” as we moderns practice them, do not appear in Scripture. The arranged marriages and politically and religiously motivated unions found there are rarely openly endorsed or forcefully proscribed by Scripture.