God has made us known the path of life to save our souls.
You have made known to me the path of life; you will fill me with joy in your presence, with eternal pleasures at your right hand. (Psalms 16:11)
But, the problem is that there is also a path that leads us to death. Moreover, the path of death seems right to a man.
There is a way that seems right to a man, but in the end it leads to death. (Proverbs 14:12)
It's not easy to tell from the path of life from the path of death with our common sense. For this reason, God said that we must forsake our own thoughts and obey God's thoughts.
Let the wicked forsake his way and the evil man his thoughts. Let him turn to the LORD, and he will have mercy on him, and to our God, for he will freely pardon. "For my thoughts are not your thoughts, neither are your ways my ways," declares the LORD. "As the heavens are higher than the earth, so are my ways higher than your ways and my thoughts than your thoughts. (Isaiah 55:7-9)
Then, what is the way of life God has showed us?
This is what the LORD says: "Stand at the crossroads and look; ask for the ancient paths, ask where the good way is, and walk in it, and you will find rest for your souls. But you said, 'We will not walk in it.' (Jeremiah 6:16)
Remember the height from which you have fallen! Repent and do the things you did at first [the first works: KJV]. If you do not repent, I will come to you and remove your lampstand from its place. (Revelation 2:5)
Keeping and following the teachings that Jesus granted us at first -- it is the path of life. Some claim, "Isn't it better to celebrate Christmas than not to celebrate any day although it was the birthday of sun-god?” Others think it's better to keep Sunday rather than to keep Saturday which is the Sabbath day because most people rest on Sunday and more people can come to God. There are also people that it doesn't matter to erect a cross because they remember the sacrifice of Christ whenever they see the cross although it was once used as an execution tool and it was even used as a symbol of pagan religion.
But, there are no verses in the Bible which indicate that Jesus was born on December 25th, which specify that the Sabbath was changed to Sunday, or which teach us to erect the cross. The teaching Jesus taught originally and showed us as an example is the new covenant including the Sabbath day and the Passover.
Please do not forget the words of God: "There is a way that seems right to a man, but in the end it leads us to death." Any other gospel that deviates from the path of life is mere the path of death whatever people make any excuses. We should forsake our thoughts and acknowledge the ancient path is the good way, and then repent and do the first works: it's the path of life.