The Lord’s answer seems harsh, but it is perfectly suited to the case of this man. It seems like a powerful reason for him to delay following Christ, that his father has just died and needs to be buried, and the Lord gives a powerful answer.
Many have to follow Christ at tremendous cost to themselves. A person who has been converted from a strict Moslem family may have to pay a great price in becoming a disciple of Christ, but he must pay it. For his part, he does not reject his family. He would like them all to join him in becoming followers of the Lord, but that may not happen, and therefore he may have to suffer their complete rejection in turning to the Lord. He must be ready to pay this price. It is the will of God in his case that he should make this difficult choice. He will not do so without pleading with them with all his heart, but he is ready for the worst as far as they are concerned. They may come with him on his spiritual journey, but he will not return to them in the unbelief, or their false religion. Do not delay in following the Lord when he calls you. You have come to a crisis point in your life, and your eternal future depends on how you respond. You have learnt enough about yourself to understand that anything that would tend to take away the urgency of your situation is dangerous. You have lived all your life up to this point without understanding the importance of coming to Christ. Now he has opened your eyes just a little and you must act on what you see. You will then be given more light. But if you prevaricate you may lose what you have and never be called by God again. Therefore you must take drastic action, as the man who cuts off his right hand in order to avoid hell. If your concern is to witness to your family, then you can do that as a believer. But you cannot safely put off responding to the Lord as soon as he calls you.