Convenient is an archaic word for suitable. God didn’t create man with the purpose of acting like the devil. There’s much more in there than just homosexuality.
Many sinful behaviors are mentioned, but sexual corruption is a key step in the chain of depravity and marks a critical transition. Here's the succession of events described in Romans 1:
God reveals the descent into evil. At some point he ceases striving to save and actually hardens the hearts of people, giving them over. They become "reprobate", rejected. According to Romans 1:26 God has rejected the sodomite.