I'm not seeking to argue, but my experience has actually been that due to misunderstanding (and some errors in the past millennium) ... much of modern Christianity actually misunderstands God and doesn't see Him as He is - which IS agape/love and yes, He is incredibly merciful.
That doesn't mean there won't be consequences for those who set themselves against God. God is the source of everything good, and by cutting themselves off from Him they can ultimately suffer for all eternity. But it's not because God isn't merciful, or that He demands/desires them to suffer. It's because they will reject the mercy God offers, and eventually even the fact of His mercy (which they reject) will torment them.
We should never try to understand God through the lens of the Old Testament only. Look how badly the Jewish people got it ... they utterly failed to recognize God in person when He showed up, and many actually hated Him.
Rather we should understand God as He has been revealed, in the Person of Jesus the Christ, Son of God. He is not different in character or will from God the Father.