More than 40 years ago I started witnessing on the streets in Australia and other countries. This was about 2 years after the Lord saved me, brought me out of darkness into His marvellous light. He delivered me from my old life and from where I was otherwise headed, to Hell. (All bold are my emphases added. Square brackets [ ] indicate meanings of words. King James Version Easy-Reading Bible (KJVER) used.)
Since that time I have met various Christian groups who also were on the streets trying to convert others to their particular form of religion. Some taught that you must be filled with the Holy Spirit and speak in tongues to be saved. Some said that tongues was necessary evidence of your salvation. Some required that a person be baptised, by full immersion in water, before she could be saved. In every case, such doctrines depart from the simple clear teaching of the Scriptures. Those with false teaching always require some sort of works. They would say, yes, Jesus saves but you have to do this or that first, including additions like you have to continue to obey all commandments, or you must no longer sin anymore, or you will lose your salvation. They are adding to the true gospel.
Matthew 19:14 But Jesus said, Permit little children, and forbid them not, to come to Me: for of such is the kingdom of heaven.
Salvation is simple! (See note at bottom of this article.) But humans always want to add something of themselves, so that they might earn some merit, even just a little.
Some, like one Seventh Day Adventist (SDA) guy, I once met on the street, argued that a Christian must meet and fellowship on Saturday in order to be saved. He even said that those who meet on Sunday are receiving the ‘mark of the beast’ and are doomed to Hell, because they are failing to keep the fourth commandment.