That's the problem. God is a God of justice as well as a God of love. What would you think of a loving court judge who allowed someone who raped three women and cut their throats to go free because the judge loved him? You would be the first one to say, "Where's the justice in that?"
So, if people are lying, thieving, blaspheming, adulterers at heart, which we all are, and are encouraged to adopt Christianity without fully realising that they are sinners in the light of the Ten Commandments, then their profession will be superficial and shallow, and would be most likely to fall away after a relatively short time. And such converts could think they are born again better than anyone else because they think they are more good than others and they are doing God a favour by joining His church.
I think that if the rich young ruler came to you, got down on his knees, and asked, "Good believer, what can I do to inherit eternal life?" You would welcome him with open arms and say, "God loves you, so pray this little prayer, and you will be saved and life will be great from now on!"
But is that how Jesus dealt with that young ruler?
Think about it.