Do you take passover with bitter herbs still ? Why or Why not
No, that would be in direct contrast to the New Testament Passover symbols...
Luk 22:15 And he said unto them, With desire I have desired to eat this passover with you before I suffer:
Luk 22:16 For I say unto you, I will not any more eat thereof, until it be fulfilled in the kingdom of God.
Luk 22:17 And he took the cup, and gave thanks, and said, Take this, and divide it among yourselves:
Luk 22:18 For I say unto you, I will not drink of the fruit of the vine, until the kingdom of God shall come.
Luk 22:19 And he took bread, and gave thanks, and brake it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me.
Luk 22:20 Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.
Haven't you read that Christ changed the symbols to Unleavened Bread and Wine?
Do you roast a lamb still for passover ?
No, same verse and many others...
Mat 26:26 And as they were eating, Jesus took bread, and blessed it, and brake it, and gave it to the disciples, and said, Take, eat; this is my body.
Mat 26:27 And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it;
Mat 26:28 For this is my blood of the new testament, which is shed for many for the remission of sins.
Mar 14:22 And as they did eat, Jesus took bread, and blessed, and brake it, and gave to them, and said, Take, eat: this is my body.
Mar 14:23 And he took the cup, and when he had given thanks, he gave it to them: and they all drank of it.
Mar 14:24 And he said unto them, This is my blood of the new testament, which is shed for many.
Joh_6:32 Then Jesus said unto them, Verily, verily, I say unto you, Moses gave you not that bread from heaven; but my Father giveth you the true bread from heaven.
Joh_6:33 For the bread of God is he which cometh down from heaven, and giveth life unto the world.
Joh_6:34 Then said they unto him, Lord, evermore give us this bread.
Joh_6:35 And Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst.
Joh_6:41 The Jews then murmured at him, because he said, I am the bread which came down from heaven.
Joh_6:48 I am that bread of life.
Joh_6:50 This is the bread which cometh down from heaven, that a man may eat thereof, and not die.
Joh_6:51 I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.
Christ is the Passover...
1Co 5:7 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:
1Co 5:8 Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.
And notice that Paul says "Therefore let us keep the feast" and then continues on to show he was speaking of the Days of Unleavened Bread.
1Co 11:23 For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which he was betrayed took bread:
1Co 11:24 And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me.
1Co 11:25 After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
1Co 11:26 For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.
Paul admonishes us to keep the Passover with the New Testament Passover symbols that Christ instituted on Passover, April 25, 31AD.