1] do Muslims worship the same god as Catholics the god of the bible?
Well, there is only one God.
Muslims (as well as Jews) profess to worship the God of Abraham, the one True God. We also profess to worship the God of Abraham. We recognize that this God is a Trinity of Persons, Muslims (and Jews) do not. Does that mean they do not worship the God of Abraham? No. It means they sincerely believe they are worshiping the God of Abraham, but we believe they have incomplete or incorrect knowledge of Him.
So, yes, in the sense that there is only one God, and we all claim to worship Him, we worship the “same God”. Don’t confuse that to mean that we believe the same thing about God, or that we are all three correct about that God. Catholicism would reject the idea that everyone is fine worshiping God as they see fit, and anything goes. Our mission in evangelization is to bring people to the truth about who God is.
We acknowledge their sincere search for God, but of course we believe they are mistaken about many things, including the nature of God.
Is Islam a religion of peace to be accepted, or should we preach the gospel to them as well and look to convert?
The Church doesn’t have any teaching on Islam’s tenets of faith. We have teaching on our own tenets of faith.
Yes, we are called to evangelize all people.
No. Islam is, in essence, a derivation of the Arian heresy mixed with tribal paganism of the 7th century, Iconoclasm, and some elements of Judaism and Christianity.
or does it have parts of truth in it?
Most religions do, as they are mostly all a search for truth and God.
Why did the church call crusades against Islam before
Because Christian lands and people were under attack, and the Crusades were called to defend against the aggression.
yet seems to accept them today?
Define “accept”.
Do we call for invasion of countries? No. Do we call for discrimination against Muslims living in democratic societies and going about their business like good citizens? No.
Do we oppose unjust aggression and call for the defense of peoples being attacked by groups like ISIS? Yes, of course.