I would like to encourage missionaries to stop making this claim in regard to John 3:16. The verse does not teach unconditional love. It does not. You simply have to read the verse and you’ll realise this. So, let’s take a look at the verse:
For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. – John 3:16 (NIV)
The love of God in giving His Son to us, is pivoted on the condition of whoever believes in this happening. Only those who believe that God sent His Son, would earn the merits of God sending the Son and by extension, loving the world. The verse is saying that due to God’s love for the world, He gave His Son, and in giving His Son we will have eternal life and will not perish, if we believe. This love for the world in giving us His Son, is conditional on us believing. Therefore, a condition does exist, you have to believe. For those who God does not love, they will perish and you can only perish if God does not love you.
In conclusion, John 3:16 does not teach that God’s love is unconditional, as the condition of belief exists. Therefore, those who make such a claim most likely have not read the verse properly. Considering it’s one of the most famous, if not the most famous verse of the Bible, it’s pretty ridiculous that anyone can understand it this wrongly.
and Allah knows best.