Luke 9:5 (NASB) And as for those who do not receive you, as you go out from that city, shake the dust off your feet as a testimony against them.
You can't force the truth on anyone. Jesus Christ himself didn't make anyone believe in Him. You have a responsibility to spread the Gospel of Jesus Christ. You do not have the authority to make anyone believe it. Once someone rejects the message of the cross, salvation through Jesus Christ, move on! You don't have to keep beating them up with it. Stop arguing about it, and just pray for his/her soul.
Father God, in the name of Jesus Christ, we come to you first to thank you for saving us. We thank you for your grace and your endless mercy. We ask that you have mercy on those who have rejected You and Your holiness. Allow them to have yet another opportunity to believe that You sent Your precious son to take away our sins. We give them over to you, Father, because You are sovereign, and it is Your will that will be done. Help us to forgive those who have hurt us, slandered our names, and mocked us for Your sake. Keep us in perfect peace, as we keep our minds on You. Cause us to have a burden to know You all the more, to study Your Word all the more, to fellowship with You all the more. Give us Your heart, O God, for a broken nation that has strayed from Your commands. We plead for holy boldness to declare Your Word among the heathen, and wisdom to keep it movin' if we are not received. Amen.